Thanks for the writeup it's very informative and well written.
But an even bigger thanks is for the idea of the furniture dolly and scissors jacks. I recently struggled through a wobbly unsafe setup of my floor jack on top of blocks of wood to lower the rear tank on my Suburban to replace the fuel pump. In the end I had to have my neighbor help steady things while I attached hoses and wires and such. With your idea (which I already have all the parts to make) I could have more safely raised. lowered and tilted the tank. I think the only thing I would add to your setup would be to also bolt the scissors jacks to the bottom piece of wood so they can't tilt and fall sideways.
