not sure about the extent of your injury but theres a guy around here that got his arm paralyzed awhile back and had the doctors cut it off. so he's only got one arm now and still manages to lift engine blocks into his truck by himself. its all about will power. if you want to do something you can find a way to get it done. not saying you need to kill yourself but maybe build a small crane on your truck or trailer with an electric winch running the drag line if your unable to lift big stuff by hand.