there are some good ones here in some posts. We don't know the weight but it does not take too much to build one. main thing is good casters and big ones to.
Our customers generally want them after we build them so I don't have any full pictures. We just build them out of 2x4 with plywood and some triangle corner braces with plywood. just make sure casters are mounted good so they don't come off or the cab might fall.
one from here
http://67-72chevytrucks.com/vboard/s...ight=cab+dolly
this one is close to like what we build
http://67-72chevytrucks.com/vboard/s...ight=cab+dolly