Actually, I have considerable experience, just using the the racks and its canvas cover. But that is more like just tent camping. I have dreamed of the ridgid box, that you describe. Several time I went to the north Slope of the Brooks range to pick up a friend & his mules with an M211 & a M105. Once it was an honest -45f. We camped in the trailer with a respectable propane catalytic heater. It kept it comfortable & allowed us to be in or shirt sleeves (untill we turned it off for the night).
The fender wells on the inside make respectable seats & you can hang your Coleman Lanter from one of the Bows. I think we ate C-Rats, we had place on the engine's mainfold.
Lee on Alaska