My experience with trailers and HST's on hills is that the wheels lock up on the tractor when you let off on the HST pedal. The trailer, if it is heavy enough, just pushes the skidding tractor around.

Stepping on the brake does little at this point.

I think a surge brake on the trailer hitch is the answer along with never, never operating in 2wd with a heavy trailer in tow.

BTW, when I park my 5th wheel I rig up the tractor so it weighs about 3200# with me on it. The trailer weighs about 4000#.

If I keep it in low range + 4wd and hold the speed to a walking pace, the HST will stop/control the whole load on a slope that I cannot safely stop my pick-up on without skidding.

I think it helps that I tow/push the 5th wheel from the front of the tractor, not the rear.

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