An auto car on a tow dolly?

Ok so I got my eyes on a 72 demon (automatic) on craigslist that is within reach if I play my cards right, but I'd need to figure out a low cost delivery solution. I'm here in western Oregon, and it's over in Boise, and there's quite an elevation change along the way. I was gonna rent a pickup and a uhaul trailer, but they won't rent anything out to you until they inspect and clear the application (they follow some stupid BS chart on their computers that is notcomprehensive or completely accurate). Renting a pickup is just too spendy for the distance. My Dakota (5.2L 4x4 w/ overdrive) can't pull the weight on a trailer, but it could probably do it on a dolly. Problem is, I hear that pulling an automatic car damages the transmission unless you pull the driveshaft. Is that true? Or are there differences based on the age and design of the transmission? Can it be done with a 904 auto from a 72 Demon? Because i know the car at least moves under its own power so the wheels and tires may be up to the task of a dolly
from experience, pull the driveshaft, its 4 little tiny 5/16 bolts and easy to do, just make sure you check the trans fluid after you get home and the shaft back in as the rear trans seal may leak.