Ok, thanks for the help guys. Another relatively minor issue, is we have a nearly enclosed cover that our MH is under. It is about 12'6" in the center, so raising a fiver would really aggravate that problem. Fortunately, it is on a dirt/gravel floor and can get a tractor in there and remove a few inches if needed.
Looks like this process is going to take a lot of thought. There is a small RV show this weekend an hour away from here. I think I will go check it out and take a tape measure with me so I can see exactly what I am dealing with.