What’s below the surface is at least as important as what meets the eye. Look for all-aluminum unibody construction, which makes the trailer stronger and more durable. Be sure the trailer is specifically engineered for its intended use.
You don’t want a trailer that’s “overbuilt”, resulting in you towing more down the road than you need, or “under built” so it lacks the structural integrity necessary to do the job you need done for the long haul.
Look for heavier I-beams that are closer together and span the entire width of the trailer. Be sure that all of the components – floors, side walls and roof -- are extruded to fit together like a puzzle and then welded together, not just welded together as individual pieces. This adds safety and solidity to the trailer’s structure. It also adds to the finish of the trailer. It looks better.
Consider the details, like L.E.D. lights that enhance visibility when traveling down the road. Or how rivets are affixed. Look for a “pierce and roll” rivet system so no rivet fully pierces into the roof, reducing opportunities for water leakage. The last thing you want is a wet interior. Unfortunately, standard riveting can create hundreds of holes in the roof of a trailer where water can infiltrate if rivets or openings become worn. This “pierce and roll” rivet system used in the aircraft industry is just one example of a smart design that delivers down the road.