I wouldn't say the 1"x1" is overkill because it will have to withstand the dynamic load of a RTT. Mine weighs 200lbs and the lid holds it no problem. The only thing I can think of for the skin is you don't want something that is so thin that when you weld it to the frame all the welds show...
I had US Wheel Adapters build me a set of spacers/adapters for my trailer because I wanted to use factory Nissan rims on it. (https://www.uswheeladapters.com/). He was able to make a 6x5.5 trailer hub to 6x4.5 rim spacer with the same lug threads that are on my Nissan (again standardizing...
This is exactly the reason I put a tailgate on my M100. I can still get into the trailer when the tent is up. However, I find that most of the stuff comes out before the tent goes up anyway, i.e. camping chairs, bedding (in the North Face bag), table, grill, cooler, etc. Having access to the...
I built a removable top that is is held on with only the hinge bolts, hydrolic supports and the latches. In order to do this you will have to box in the front of the trailer like the bottom photo to strengthen it (in this photo it is not quite done but you get the idea). You will also notice...