Your problem is that it won't fit between the wheelhouses on the bed. It is generally not to big for the bed because they are all less than 48" wide and 7' long. At 698 pounds, you can't pick it up and set it like a toy truck on top of the wheel houses but if you could, it would fit. Am I right or am I right?
And, the ranger will handle 698 in the bed.
So, why don't you just consider block and tackle to drop it in there. I have a couple of these:
And, if you have a tree, you can drop it in there or take it out. You just make a basket lift with ratchet straps which you then use to tie it down (although when it is sitting in the bed all cockeyed, you won't need to tie it down.
PS, if there are no trees with branches where you are going, every barn and commercial garage near the cabin will have an overhead beam that will easily handle the 700 pounds.