The primary suggestion is have, which I have searched for and can not find, is to add the ability to wrap meat in paper. This will extend the time before it goes rotten, but not as long as cooking or drying it will. This will allow for hunters to harvest an animal, and continue hunting, without having to stop to cook or dry the meat to prevent it rotting. It will also allow for truck bases to carry a supply of meat ready to be cooked for longer.
My other one, which I'm sure has been suggested before, is to add the ability to swap the tarp on the truck for camo netting.