Looking at purchasing a safe and Reliable Motorhome

If you are specifically interested in a Cummins/Allison rig, then you are mostly looking at diesel pushers. Most of them come with air brakes, because that is a better way to stop one of these heavy vehicles. Sure there are diesel Class C's, too.

I suggest, like others, that you not get locked in to a certain specification, but rather keep an open mind for a rig that will suit your specific family's needs.