What should I run for tire pressure. I have the Stock Firestone AT's The door jam says 45psi front and 55psi rear if I recall correctly. The tires say 65psi max cold?

 

Go by the sticker on the door jamb. It's been covered here lots, and there ARE numerous reasons for the recommended pressures. If the wear starts to show uneven in the tread, then adjust them down or up.

Someone here mentioned that they could hardly keep their EXC on the road with 5 lbs less in the fronts.

Stay with the sticker.