I have 2 diesel generators for sale. Diesel is the perfect fuel source for a generator on a diesel school bus as it doesn't require a 2nd fuel source to operate.
The generators are MEP-802a 5kw military grade generators. They both have 15 hours of operation on them. They are rather large for schoolies, as they are built into a skid based enclosure, but would be perfect for those that have the "know how" to remove the components from the enclosure and build it into your schoolie, or those with a back deck that it can sit on.
They both start up and run perfect. They both supply 120v & 240v power in 1 phase or 3 phase configuration. They are very quiet and you can have a normal conversation standing beside them. You can do a search on Youtube for "MEP-802a" to find more information on them.
Commercial Onan quiet diesels are packaged a little better for schoolies and RV's, but cost at least $8,000 plus. I'm selling these for $3,200 each.