IMHO she should consider a super C or a class A. Here is why. If she is going to full time in a 5th wheel or TT then her tow vehicle is also going to be her daily driver. That being said it would be better to go with a class A or a super C and tow a smaller car for a daily driver. The fuel mileage for a drivable rv compared to the fuel mileage for the tow vehicle when towing are close to the same. Being parked for a period of time will be saving money if she has a small toad compared to a 3/4 ton truck as a daily driver. Also as a full time rv a Super C or class A will offer more room and more storage.