if your blazer happen to have the spar tire mount on the back then what we use to do was take a tarp or a burlap bag anything we had to keep sum of the dirt off from it and put it inbetween the tire and the back hatch on our bronco and we would pick the deers upper half up and lay it on the tire and grab it by the back half and push it up there then we would just take and tie it off to the tire or the trailor hitch if you have one i have loaded a 175lb do by doin this it may take a min till you get used to it but it works also the tree thing works another thing you could do if you wanted was get sum rollers like you would fine on a boat trailor and weld up a thing or make sumthing to hold a boat winch on the front of the truck so it sticks up almost even with the roof and take to rollers and put on on the front and one on the back and just whinch the deer up there

lol never done that one just thought about it should work tho