I would definitely be planning on additional structure in the walls around the slides. I looked at box trucks as a potential basis for a build like yours, and the wall constructions seemed geared more towards light weight than max interior width than strength. I'm just assuming the weight of the slide out hanging 3' off the side of the truck has to put serious strain on wall supporting it. Along the same vein I'd be thinking light weight construction on the structure of the slide itself. Being basically a rectangular box it should be pretty strong just on the geometry and not have to get carried away with heavy tubing.
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