1) There are those in "motorhome world" (who may or may not have experience with towables) who look down their noses at those of us who live or travel in towable RVs. Personally, I wouldn't mind having a late-model 40' diesel pusher with all the amenities they afford... but I don't have a half million dollars or more to spend on it.
2) OP - define "light weight" and tell us what truck you intend to pull a fifth wheel with. There are a lot of options out there, including some nice ones that people are towing with properly equipped F150 EcoBoosts (Max Tow and Max Payload packages). The weights, capacities, and capabilities of your tow vehicle are a little more complicated than most people realize. Give us some more information and we can better assist you.
Rob