My dad has similar issues and for him at least, he found an aid. It wasn't pitch forking the stall that was causing his pain, he experimented with smaller and smaller fork fulls. What caused most his problems was actually pushing the wheel barrow.
He's gone the motorized route himself but you could try carts/wheelbarrows that are easier to push. Designs like bigger wheels to get over the ground easier, two wheels so you don't have to try and balance the load and handles at different heights that fit your size better.