A fellow that, before he retired, was our chief door hanger made this one. Our shop guy made a couple others very similar. Every time we pull them out, nobody has ever seen anything like it. They sure do make handling doors easy. It lays over to install hinges:
Adjustable for taller or shorter doors:
Regulation wood clamps with soft leather and a little piece of carpet as to not mar the doors:
And a little shelf with another carpet square on the bottom:
Just thought I'd share, since I've been hanging a few doors at my work and had the tool to take a few pictures of it.