If you're looking for a solid enclosed 20 ft trailer, you've probably noticed that this specific length is basically the sweet spot for just about everything. It's that perfect middle ground—not so small that you're playing Tetris with your gear, but not so massive that you need a semi-truck and a three-point turn just to get out of your driveway.
I've spent a lot of time around trailers, and the 20-footers are consistently the most popular for a reason. Whether you're hauling a classic car to a show, moving your kid into a college apartment, or running a landscaping business, this size just works. But, before you go out and drop a few thousand bucks, there are a few things we should probably talk about so you don't end up with buyer's remorse.
Why 20 Feet is the "Goldilocks" Size
Most people start their search looking at 12 or 14-foot trailers because they're cheaper. Then they realize they can't fit a full-sized vehicle or all their shop tools in there. On the flip side, a 24 or 28-foot trailer is a beast to park and eats up a ton of fuel.
An enclosed 20 ft trailer gives you enough floor space to actually move around inside. If you put a car in a 16-foot trailer, you're basically crawling out the window to get out of the vehicle. In a 20-footer, you've usually got a few feet of "nose room" for a workbench or tool cabinets, plus enough space to actually open the car door. It's comfortable. It feels like a mobile garage rather than a cramped shipping container.
What Are You Actually Hauling?
Before you pick a brand or a style, you have to be honest about what's going inside. This dictates everything from the type of flooring you need to the height of the ceiling.
Cars and Toys
If you're using it as a car hauler, you're going to want a ramp door. Most enclosed 20 ft trailer models come standard with a rear ramp, but make sure it has a "beavertail." That's just a fancy way of saying the last few feet of the trailer floor angles down. It makes the loading angle much shallower, which is a lifesaver if you're loading a car that sits low to the ground. You don't want to hear that gut-wrenching scrape of your front bumper hitting the ramp.
Mobile Workshops and Contracting
For the tradespeople out there, a 20-footer is a dream for a mobile workshop. You can line the walls with shelving, put a miter saw station at the front, and still have a wide-open aisle to haul materials like 4x8 sheets of plywood. If this is your plan, pay attention to the wall studs. You'll want 16-inch on-center framing rather than 24-inch so the walls are sturdy enough to hold the weight of all those heavy tool racks.
Steel vs. Aluminum: The Great Debate
This is where the price starts to jump around. You've basically got two choices: a steel frame or an aluminum frame.
Steel trailers are the workhorses. They're heavy, they're durable, and they're generally more affordable. If you live somewhere dry, steel is great. But, if you're in the rust belt where they salt the roads if a single snowflake falls, you've got to stay on top of the maintenance. Steel will eventually rust if you don't take care of it.
Aluminum trailers are the "buy once, cry once" option. They're significantly lighter, which means you can carry more cargo without exceeding your truck's towing capacity. They also won't rust out on you. The downside? They cost a lot more upfront. If you're planning on keeping this enclosed 20 ft trailer for ten or fifteen years, aluminum is usually the way to go. If you just need something for a couple of years to get a business off the ground, steel is perfectly fine.
Don't Forget the Roof and the Nose
It sounds silly, but look at the roof. A lot of cheaper trailers use a "galvalume" roof, which is basically several sheets of metal seamed together. These are okay, but those seams are eventually going to be a leak risk. If you can find one with a one-piece aluminum roof, grab it. It's one solid sheet of metal from front to back, so there are no seams to fail over time.
Then there's the "V-Nose" vs. "Flat Front" debate. A V-nose enclosed 20 ft trailer adds a little bit of extra interior space (the "V" usually adds about 18-24 inches of length in the center) and it cuts through the wind a little better. It won't magically double your gas mileage, but it does help with stability when you're cruising down the highway at 70 mph.
The Axle Situation
Since we're talking about a 20-foot trailer, you're almost certainly looking at tandem axles (two sets of wheels). This is non-negotiable for this size. Tandem axles provide a much smoother ride and better weight distribution. More importantly, if you blow a tire on the highway, a tandem axle trailer is much easier to control than a single axle.
Check the weight rating, too. Most enclosed 20 ft trailer setups come with two 3,500 lb axles, giving you a Gross Vehicle Weight Rating (GVWR) of 7,000 lbs. Keep in mind that the trailer itself probably weighs around 2,500 to 3,000 lbs. That leaves you with about 4,000 lbs of actual cargo capacity. If you're hauling a heavy diesel truck or a bunch of skid steers, you might need to upgrade to 5,200 lb axles.
Little Details That Make a Big Difference
After you've figured out the big stuff, look at the small details. They'll tell you a lot about the build quality: * LED Lights: Don't even bother with incandescent bulbs. LEDs are brighter, last forever, and draw less power. * E-Track: If the trailer doesn't come with E-track (the metal rails for strapping down cargo), plan on installing it. It's the most versatile way to secure literally anything. * Side Door: Make sure the side "RV-style" door has a flush lock and a deadbolt. It's a huge pain if you have to use a padlocked bar every time you want to grab a screwdriver from the trailer. * Radial Tires: Some cheap trailers still come with bias-ply tires. You want radials. They run cooler and last longer on long highway hauls.
Towing it Safely
I can't talk about a trailer this size without mentioning the tow vehicle. Even though an enclosed 20 ft trailer is manageable, it's still a big box behind you. When the wind picks up, it acts like a giant sail.
If you're using a half-ton truck, I highly recommend a weight distribution hitch with sway control. It makes a world of difference. Instead of the trailer pushing the back of your truck around, the hitch helps level everything out and keeps you in a straight line. Also, make sure your brake controller is dialed in. You don't want the trailer pushing you through a red light because the gain was set too low.
Keeping it in Good Shape
Once you get your trailer home, don't just park it in the grass and forget about it. If you want it to last, try to keep it on a gravel or concrete pad to keep moisture away from the frame. Every year, you should climb up there and check the seals around the vents and the edges. A little bit of lap sealant now can save you from a rotted floor later.
Also, grease those bearings! It's a messy job, but it's way better than being stuck on the shoulder of the I-95 with a welded bearing and a missing wheel.
Final Thoughts
Buying an enclosed 20 ft trailer is a big investment, but it's one of those things you'll never regret having. The sheer amount of stuff you can move, store, or work on inside that space is incredible. Just take your time, look at the frame construction, and make sure the axles match what you're planning to haul. Once you have it set up exactly how you want it, you'll wonder how you ever got by without it.