I'm looking at a used 28' enclosed Diamond Cargo trailer and one thing I noticed was it has "u-channel" steel framing in the walls as opposed to steel square tubing, which my previous trailer had (previous one was a Team Spirit and had poor workmanship including hacked out cutouts for lights and unsound welds on the frame) So is square tube framing just extra weight or is it an important feature to look for? I intend on converting the new trailer to a toy hauler camper so I'm not sure how the u channel framing will affect the removal and installation of wall plywood and ease of installing insulation .. probably won't figure that out until I'm elbows deep in the conversion
EDIT: I am planning to anchor quite a bit to the walls even before the conversion, like cabinets, a refrigerator, rollaway toolbox, etc which makes me nervous about structural integrity. Might just have to add some gussets to the wall/ceiling joints for peace of mind, I'm pretty good with sheet metal.
Any other experience with Diamond Cargo brand? Reputation?