I have a panel, I called Vintage Air and discussed with them. they recomended a GenII Super Cooler. but with the suburban you will have a higher heat load, so call them.
I have not purchased a system yet, but I am trying to design a console that I can run a duct through to the rear using one of the four outlets on the GenII. Right now that project is a long way off.
As far as the electrical, they may be able to advise you on that also. AC will pull a lot of amps. As long as you don't drive at night you may be able to pull it off. Joking.
