I like to back down hills or slopes when transporting any heavy weight in the FEL. I learned quickly one day that when you go down hill frontwards with weight in the FEL there is a lot less weight on the back wheels which are the only wheels with brakes.
In 4WD the front wheels help in braking the tractor, but backing down gives me better control of the decent. If the hill side is muddy or slippery your brakes may not stop you. Lowering the FEL in reverse can slow you down safer than if you are traveling foward. However,I would rather drive up hill than to back up.
I like using a small trailer for moving stones I can load by hand and then throw a couple of larger one's in the FEL. I used and old car hood for transporting stone for a number of years, the wide surface smoothed the road real well, and the low profile made it easy to roll stones on wilt the FEL or by hand.
Randy