We're looking for a bus to convert to an RV. I looked at a couple of 1992 Carpenter/Ford 71 passenger buses this last weekend. Both identical, Cummins 5.9 with Allison three speed automatics. Bus #1 had 135k miles, new tires and good batteries but had an air brake leak. It took some time for the air pressure to build and release the brakes. Body had a few minor dings. I test drove it and was disappointed in the performance. It had atough time getting up to 55 mph. I would have thought the 5.9 would have performed better.
Bus #2 had a cleaner body and engine bay, rear tires dry cracked and dead batteries.
Both were offered at around $2000.

I'm wondering if #1 had a fuel filter plugged. It would be difficult to merge with it's sluggish performance.

Other option is a 94 Blue Bird with a 7.3L diesel with around 100K. I've yet to look at it, maybe this next weekend.

Here's the plan...
http://www.vonslatt.com/bus-main.shtml