One of the first items to consider is the convenience and accessibility of the drain system for the holding tanks. It's advised that you actually go through the procedure for dumping the holding tanks with each brand of recreational vehicle you seriously consider for purchase. Make it a point to sit in all of the chairs, benches and couches and check on the views. In a motorhome it's important to check visibility from both the driver and passenger seat. If pulling a unit, check on visibility from the towing vehicle.
Safety is an extremely important consideration when using propane.
Many RVs now come equipped with electronic leak detectors. Then, consider your needs. Your personal needs will dictate what equipment you will want to consider as optional power sources. At some campgrounds the use of generators is restricted. Check the costs involved in the purchase, maintenance, and repair of supplemental power equipment.