this year I used my sitdrag + tether and linemans belt with ropemans and carbiners to hook up to my game cart (ropemans to get the length right and keep the cart from dragging)
Its amazing how easy it is to pull a loaded game cart with your waist/body versus arms/shoulders pointed behind you. Uphills that normally would've worn me out hand-pulling a cart, was a cakewalk sitdragging it
It would probably even be simpler to fab a belt with a single loop in the back to hook a carabiner between it and an eyebolt from center of cart handle, now that I think about it.
I wonder if a double shoulder pull would be even easier...like a back pack made out of one of those cheap included treestand harnesses.
Still the toughest part is probably keeping the ass end of the cart from dragging the ground too much....ropemans on each side of me made it easy
Either way, pulling the cart with your hands and arms is the wrong way to do it from my exp