Why not just make a new Tonnau cover for it? Much easier than doing a real bed. Or a truck cap, or a camper shell, or...
When did I say anything about bed not working on a truck?
Dropping a bed won't work on either of the CAR chassis, but on a TRUCK chassis, it's all good. In a post on BitPimps, I went into how much depth you could get in the bed this way vs. the way I did on "Desperado".
You don't *NEED* anything. Having the thixotropic agent gives a faster buildup than applying CA in thin layers, or applying think enough to be risking curing issues with it. It's a bit more structural with a thickening agent than without, but again it's your ride do it your way. If you need extensive changes, or have gaps that don't want to fill easily, you'll definately want to try it.