I looked hard and long at everything out there... including Cargobody
cargobody website . I got real lucky when I found a guy 4 blocks away from my house that had one, and has been using it exactly how I'll be using mine, in baja. It's the only one I've seen in SoCal. He said he got it from his dad up in Montana and I got a chance to look it over and he told me how it responds off-road as well as around town. We talked a few hours on it.
He had some good things to say about them, said you feel 'em back there on the road as well... they run 450-500 empty, and go up from there as you load 'em up. They're really solid, and very well made, rear doors and hardware are the very best I've seen, have great insulation value, and they're a bit on the butt-ugly side. It's definitely uglier in front of you than it is on a website. They're great because you can remove them with stands, like a camper, but I don't know how practical this is traveling. Might be nice at home when it's not in use though. I can't say enough about how well they're made.
2 things turned me off; cosmetics, and price. Good luck finding a used one. New ones run about 8-10K and more, depending on your setup. This price came from two different sources, but I never priced it direct from Cargobody. In the end, I went with a Caravan shell out of Reno. I flew up to where they make 'em and talked to the owner before I ordered it, just to check out the quality. It will suit my purposes better for Mexico, at less than half the price. The Cargobody definitely has it's niche in the market though.
sarj