How can I try out a class b motorhome (Camper Van)?

[YUKON]

My wife and I are retired and want to travel at will. We are interested in buying a Class B motor home but we won't take the plunge until we have tried one for at least a weekend. We have no rv experience. We want as much luxury/convenience and comfort as possible. My searches tell me that class B's are not rent-able commercially. Is it possible to find an individual who would rent theirs? Would an RV club or blog have this information? Could you suggest an RV club in the St Louis area