I sold my old camper to a dually owner. I put the homemade angle brackets on front jacks that were given to me by previous owner. Boy, that was scary! The higher I raised the camper, the more they bent. They each were made with 2 angles (3/8 thick steel) inverted to form rectangle and reinforced with 3/4 rebar. Just looking at them I would have thought they would have been adequate. Not so much in practice. If you fab some up make them better than the ones I had.
My brother has that same truck. Its relegated to farm duty now, but i remember him saying 11 downhill with a tailwind empty and gallons per mile with a load. But, like you said, its paid for.
