In photos 1,3, and 5, those trucks had V-8's, early hemis by the V emblems on the hood. Pic # 4 is a ' 55 or '56 was probably a flathead 6 or a V8.
That's an interesting rig, but I don't think that I would like driving it. It looks similar to a Chevy Dreamliner but I'm pretty sure that it isn't, so what is it?