I'm posting this reply again, as I'm not sure what happened to it the first time, so I hope it doesn't double post.
Here is the bus that I'm looking at now, I will get more photos when I get the chance, as well as exact specs. It is a 1993 GM built with a blue bird cab, and a GM 366 BBC. It's a small bore tall block, so low HP, but good on torque. I know many may suggest a diesel, but I have no intention of getting into working on medium duty diesels again. When you have big problems, I can't afford the fix. I want a long lasting cheaper alternative, and I think that a 366 will suit me fine.
My current truck, as stated above, is a 1995 C2500 with a 6.5L Detroit Diesel V8. It's fairly lacking in the power department, but it produces good MPG's, and it is my daily driver, not just a towing truck. The first picture is of the truck and my 28ft RV. Note that the stance of my truck looks really funny, but the front tires on it are 265/75/16, while the rear are 245/75/16. That contributed a lot to the odd stance. The second photo is just a regular picture of my truck, same off tire sizes. If I happen to post more of my truck, keep in mind the tire set-up may change, as I have about 10 tires I've rotated out on it. (Used to work oilfield, so I had to change flats a lot, so having half a dozen spares helped keep me going!)
Now, keep in mind what I want to do. Here is a similar set up, though I think little of fords.