UnderCover SwingCase Review: Great Under a Cover, Fragile With Age

Buy the UnderCover SwingCase if you already run a tonneau cover or a cap and want a locked, mostly dry spot for straps, a jack, jumper cables and a few tools without giving up any bed length. It's a plastic case that hangs on a hinge in the corner behind the wheel well, swings out over the open tailgate so the contents come to you, and lifts off its pins when you need the whole bed. RealTruck, which owns UnderCover and now sells it as the RealTruck SwingCase, rates each case at 75 lb and 1.5 cubic feet.

The catch arrives a few years in. The case is ABS plastic with a 1-year warranty, and the failures that matter (a case that cracks and leaks, a broken hinge, a snapped release lever) tend to show up after that year is gone. Many trucks also need holes drilled in the bed, the case covers the rear tie-down on its side, and there's no SwingCase for the 4th gen Tacoma. We'd still buy one for the job it does. Just buy it as a part that lasts a few years, not a lifetime.

The short version

What works:

• Lives under a cover: it sits below the bed rails, and its Amazon listings say it keeps a 3-inch clearance and works with virtually all tonneau covers, soft, hard, folding and rolling. That claim holds up under BAKFlip, TruXedo, Peragon, Gator and UnderCover covers.
• Reach without climbing in: drop the tailgate, pull the yellow release and the case swings out nearly 180 degrees toward you.
• Full bed length: it uses the dead corner between the wheel well and the tailgate, and the case lifts off its hinge pins in seconds when you need the space.
• Exact fit: one part per truck and per side, with confirmed listings for eight of the truck generations we cover.
• Dry inside: a sealed, key-locked lid keeps contents dry, even under covers that leak.

What to watch:

• Plastic durability: cracks from overstuffing, cases that turn brittle after a few years, broken hinges and release levers.
• Short warranty: 1 year, original purchaser only.
• Drilling: self-drilling screws or drilled holes on many trucks. The F-150 needs none.
• Tie-downs and width: it covers the rear tie-down on its side, and owners have confirmed 4 ft wide loads between a pair only on the Tundra.
• Small: 75 lb and 1.5 cubic feet per case. Two cases hold about a third of what a full-size crossover box does.

Which trucks and beds it fits

The SwingCase is sold by truck and by side, not by bed length. Each truck gets a driver side part (the D suffix) and a passenger side part (P), usually on separate listings, and a few trucks also have a driver and passenger set. RealTruck's install guides say the cases are left and right specific and won't swap sides. We confirmed every Amazon listing in the fitment table on its own product page, and that table under the score panel carries each part number, side and restriction.

• F-150 (Gen13 and Gen14): SC203D and SC203P, listed for 2015 on and including the Lightning, so the same parts fit the 13th and 14th-generation F-150. RealTruck says the F-150 install needs no drilling, and factory stowable bed ramps have to come out. The driver and passenger set listing names 2015-2020 only, so on a Gen14 buy the two single listings.
• Silverado and Sierra 1500 (T1XX): SC104D and SC104P for 2019 on. The listings say neither fits the CarbonPro bed or the MultiPro tailgate, and RealTruck's install guides add the factory GM storage boxes. The driver listing's title reads 2019-2023 while its bullet reads 2019-2025, so a newer truck should confirm with the seller.
• Ram 1500 (DT): SC302D and SC302P for the 2019-on New Body Style, and neither works with RamBox. The listing titles also name the 2500, but RealTruck's install guide says the parts won't fit 2500 and 3500 models; we'd go by the guide. The Ram 1500 Classic isn't named.
• Tacoma (3rd gen): SC401D and SC401P, listed for 2005-2023, which spans the 2nd and 3rd gen. On 2019-2023 trucks these parts expect the factory bed storage box: the driver listing says so in its title, RealTruck's SC401D page says it won't work without it, and the passenger install guide says the same for 2019-2022. For a truck without the box, RealTruck's driver side part is SC403D, whose Amazon listing had no offer when we checked.
• Tacoma (4th gen): nothing. We found no SwingCase for the 2024-on Tacoma on RealTruck's site or on Amazon, and an owner with a 2024 Trailhunter who had a pair on order was told UnderCover wouldn't be making them.
• Tundra (3rd gen): SC404D and SC404P, not for trucks with the Trail Edition bed storage boxes. The single listings read 2023-2025 and RealTruck's product pages 2023-2026, but RealTruck's install guides read 2022 on and the set listing names 2022-2023, so a 2022 owner is covered by the set.
• Maverick: SC207D and SC207P. RealTruck says the driver side won't work without the factory power outlet option, and its install drills out the outlet bezel. The single listings read 2023-2025 and the set 2022-2023.
• Colorado and Canyon (3rd gen): SC107D and SC107P, listed for 2023-2025.
• Ranger (6th gen, 2024 on): RealTruck lists SC209D and SC209P for 2024-2026, but we found no Amazon listing, so check fit for your truck with the Ranger search in the picks. Ford sells its own swing-out storage box for the Ranger; we treat it as a separate product.

A few other conflicts decide it before the truck does. RealTruck says the SwingCase won't work with bed extenders. A plastic drop-in liner or a BedRug has to be trimmed so the brackets sit on bare sheet metal, while a spray-in liner is no problem. On a Tacoma, plan on choosing between a SwingCase and aftermarket bed stiffeners; we haven't seen anyone run both. And if you're pairing it with UnderCover's own Ultra Flex on a DT Ram, RealTruck lists the 5 ft 7 in part for trucks without the multifunction tailgate as not compatible with the SwingCase.

The specs that matter

RealTruck publishes the same figures on every SwingCase part page:

Run the numbers for a pair. Two cases give you 3 cubic feet and 150 lb of capacity. UWS lists its 69 in low-profile crossover box at 8.4 cubic feet, so a pair of SwingCases holds about 36% of it, roughly a third. That's the trade: the crossover box sits on the rails and covers about 20 in of bed behind the cab, and it rules out a standard tonneau, while the SwingCase gives up capacity to keep the bed and the cover. RealTruck doesn't publish the case's own weight, so the payload math stops at the 75 lb of contents per side.

Treat 75 lb as the ceiling. Some owners repeat an 80 lb figure; RealTruck's pages say 75. The case hangs from its hinge, so a full load puts a lot of weight on one end, and RealTruck says to keep it stowed with the lid closed and latched while you drive. A tall, narrow box also packs awkwardly. It suits straps, a bottle jack, a hitch, a first aid kit and cordless tools better than a full socket set.

Water, security and the bed space it takes

The lid seal does its job. Contents stay dry in weather, and they stay dry under covers that don't: on a Tundra with a BAKFlip that leaked at the sides and corners, nothing in the SwingCases ever got wet. The exception is a damaged case. Once the plastic cracks, water follows the crack, and one of a pair that went brittle cracked badly enough to leak.

Copies sell for around half the price, and we'd skip them. The look-alikes on Amazon and eBay look nearly identical, but their plastic is less robust, and a knockoff owner found the foam seal let water in during a downpour. Claims that the copies come from the same factory are guesses, and the copies come without RealTruck's warranty.

Security is a deterrent, not a safe. The lid locks with a key, and RealTruck's current install guides include a keyed pivot lock that keeps the case from being lifted off its pins while still letting it swing; some older kits left that to a padlock you bought yourself. It's still plastic, and an owner who has one reckons enough force with a screwdriver would break the lid. Under a locked tonneau or cap it's well protected. On an open bed, keep the expensive tools in the cab.

On bed space, RealTruck says you keep your bed length and minimum width, and length is the easy part. Width depends on the truck and the load. Tundra owners with a pair still slide a 4x8 sheet or a standard pallet between them. We haven't seen that confirmed on the other trucks, so measure before you count on it. Since the cases come off in seconds, lifting them out for a wide load is a minor chore. The tie-down is the bigger annoyance: the case covers the rear tie-down on its side, so strapping to it means snaking a strap around the case. Owners who need that anchor bolt a new one elsewhere. Don't grind or cut the brackets to keep it, because RealTruck says modifying the mounting hardware voids the warranty.

Build quality and living with it

Durability is where the SwingCase loses points. The case and the release lever are plastic, and the failures follow a pattern: a garage-kept Tacoma case that looked new after a year and later cracked down one end from overstuffing; a pair that turned brittle after a few years, with one cracked badly enough to leak and the other's release lever snapped; a hinge that broke after 3-4 years, with no replacement hinge for that older style. A six-year-old case needed its catch cleaned and adjusted a couple of times a year. And brand-new cases that shook and rattled from day one left their owner expecting little from them long term.

The other side is real too. Owners five and six years in still like theirs, and the reports of sag come mostly from cheaper copies. To us that describes a case that holds up fine for light gear and gets fragile when it's packed tight or banged around with heavy tools.

The warranty doesn't cover that timeline. RealTruck warrants the ABS structure, the lock, the hinges and the hardware for one year from purchase, for the original purchaser only. The failures that matter mostly arrive after the first year, at a few years or three to four years in. Two more exclusions worth knowing: modified mounting hardware voids it, and so does damage from chemicals not labeled safe for plastics. RealTruck specifically warns against storing insect repellent, brake fluid and solvents in the case.

For rattles, start with the latch. RealTruck's guides say the latch has slotted holes for adjustment and that the case shouldn't be slammed shut. Line the tray with rubber or carpet if loose tools chatter.

How it compares

The SwingCase is the cheapest way here to lock gear under a cover. Specs come from each maker's own pages:

• BAKBox 2: the other under-cover box from the same parent company, and it holds more weight. But you have to open the cover to reach it, while a SwingCase swings out with the cover closed. BAK's own BAK Box no longer fits the redesigned MX4 rails, RealTruck's page showed it as temporarily unavailable, and the Amazon listings we found were for older trucks only, so it isn't in our picks.
• DECKED Drawer System: the step up for a truck that carries tools every day. It holds far more and lasts longer, with a limited lifetime warranty, but it costs several times as much and gives up about a foot of bed depth.
• A crossover box: nearly triple a pair of SwingCases, in metal, for a lot more money, and the box blocks a standard tonneau cover.
• A tote and a cargo bar: under a locked cover, a plastic tote held in place by a ratcheting bar or a board does the same job for a fraction of the price. The SwingCase earns its price by being reachable from the tailgate and staying put.

Installing it

RealTruck puts the install at 30 minutes or less with the included hardware. The work depends on the truck, so read the guide for your exact part before you order. Here's what each one asks for:

• F-150: no drilling. Torx bolts go through existing holes, and the striker bracket mounts over the Box Link plate with the tie-down left in place.
• Silverado and Sierra 1500: seven sheet metal screws hold the two brackets.
• Ram 1500 (DT): six self-drilling screws into the bed.
• Tacoma (3rd gen): the SC401P reuses factory Torx bolts and adds four self-drilling screws, so four new holes. The SC403D for trucks without the storage box takes four self-drilling screws plus two holes drilled through the bed side.
• Tundra (3rd gen): eight drilled holes for four bolt plates, with the taillight and tailgate support cable removed to reach them.
• Colorado and Canyon: eight self-drilling screws, four per bracket.
• Maverick: the power outlet bezel holes are drilled out, the factory tie-down comes off and goes back on, and the taillight comes out.
• Ranger (2024 on): the factory tie-downs at the rear of the bed come off, the striker bracket goes on under them and they bolt back on over it; a Ford plastic bed liner gets drilled.

Self-drilling screws leave permanent holes in the bed. Sweep the metal shavings out, as RealTruck says, and treat the holes if rust worries you. If you have a drop-in liner or a BedRug, trim it so the brackets sit on bare metal; with a spray-in liner, clear the liner out of the bolt heads and threads before you start.

The Ranger has a trap RealTruck's guide doesn't mention. Ranger owners report the factory tie-down bolts come set with heavy thread locker, and some have stripped the Torx heads or sheared bolts off getting them out. RealTruck's guide calls them T-40 Torx Plus bolts, so use a Torx Plus bit; owners who used a plain Torx bit stripped them. If a bolt won't budge, stop before the head rounds off and get help rather than drilling out a broken bolt in the bed. Use the torque figures in RealTruck's guide for your part, not numbers from a forum post. And if the case won't release once it's mounted, don't force it: RealTruck's guides say the latch has slotted holes so you can adjust its position.

Should you buy one?

Yes, if you run a tonneau or a cap, keep less than 75 lb of small gear per side, and want it locked and reachable from the tailgate. That's the owner who carries straps, a jack, recovery gear and a cordless drill and is tired of chasing a milk crate around the bed. It's the swing-out box we'd buy, and on an F-150, where it bolts in without drilling, it's an easy call. Buy the RealTruck part for your exact truck and side, and register the warranty.

We'd pass if you need room for a real tool kit, need the full bed width often, run bed stiffeners on a Tacoma, or drive a 4th gen Tacoma, which has no part. For heavy daily tool storage, the DECKED Drawer System or a crossover box earns its higher price. And we wouldn't save money on a knockoff: the cheaper plastic is the weak point of the real one too.