There dosent seem to be any distinct seperation of bed and cab, which i'd expect to see in a truck.. it's like the cab just kinda turns into a bed.. which might lend creedence to the theory that it isnt a truck at all, but instead either a car converted to a truck, or some sort of "suburban" kind of thing.
If somebody recognises that dashboard and can put their finger on what it might have gone in, that might offer some additional clues as to what it might be.
I've decided that come heck or high water, i'm going to yank that SOB out of the hole and set her upright on level land.. so lets keep guessing and tossing out ideas and we'll see if what it is comes anywhere close to the educated guesses!