I don't know about a four wheeler, but I loaded one in the back of my pickup Friday by myself. First I dragged him several hundred yards to my truck using my two hands to hold his antlers and using my legs to proppel myself in the direction of my truck. Then I field dressed him. Then I grabbed his antlers with two hands and lifted him off the ground, and used my legs to walk along the side of my truck while holding my hands over the truck bed. As such, the deer was placed in the truck bed. The one trick that makes it a lot easier is to open the tailgate of your truck; you don't have to, but I prefer not to make things harder on myself than they have to be.