rear brakes get too hot

I think you have something wrong, dragging brakes, sticking parking cable, hoses, prop valve problem, or axle bearings set up wrong. I don't know what. When I first read this thread that's what I thought, and I think that now.

Try THIS Get yourself to an open highway. Try to take a direct route. Don't make too many stops and try to be easy on the brakes. STOP before you get on the highway and check all four wheels. Drive 10 mi, recheck, 20 if necessary, and recheck.

What happens? With rear jacked up? Does everything turn freely? Try applying brakes with rear jacked up, do they immediately release?