One of the questions most commonly asked about Bus to RV conversions is which engines are the best engines found in school (or other) buses. The short answer is "DT466 or 6CTA", but you probably want more than that, right? Maybe even a lot more. And I'm going to give it to you.
Since we got a bus to convert into an RV, I have been doing quite a bit of research into them, and gathering information which I might find useful. One question which came up was how fast one can and should drive their bus. There is a lot of variation, and many factors which come into play, but given freely available resources on the internet today it's actually not that difficult to figure out.
As I am about to start working on a Bus conversion, I'm finally ready to publish my research notes on choosing a bus for conversion. I'll have more to say later when I have more actual experience doing a conversion, but this material should be of some interest to anyone thinking of doing their own. I spent considerable time looking at buses and reading both school bus and professional bus driver forums before we made a purchase. Specific information on equipment will be largely applicable to the USA.
I grew up a poor white boy-child in Santa Cruz, which means that there were three ways in which I was privileged, and only one of them was location. Growing up with a single mother with no car when surrounded by the affluent and mobile meant that those were the only ways in which I was privileged. Any place I did not reach via operation of my Chevrolegs had to be visited via the shame train, also known as "The Bus". And riding the bus incurs a stiff penalty.