KOA campgrounds don't seem to care. There are some great channels on you tube that you can help you educate yourself. I have a 2009 Bluebird Handy Bus with a 6.7 cummins rear diesel pusher that was never a school bus that is not yet converted. I am looking to use it as a moving vehicle this spring and then sell it.
I do not have time to convert one. I would offer a suggestion. I bought the bus I did because it was white from the factory. Many places require you to repaint a yellow bus titled as an RV. Also because it was never a school bus it does not have the safety circuits that can lock out the bus from starting. I can jump in, turn the key, wait for the glow plugs, and it starts; even at 30 degF it starts like you just shut it off.