PhilWH - I know the cost of owning an RV is tough to justify, but one has to put things into perspective. We only live once. We work so we can play. An RV is not that expensive to own as it does not wear out if it sits. Tires are the one exception I can think of. Insurance is an ongoing expense, but shop around and find a company that will insure one year at a time. The company expects that you will not be driving 12 months of the year and the total rate will be less. I learned that when insuring motorcycles. Licensing (registration) can be expensive in some states, but in those states with high registration other costs are a little less like sales or income tax.
Finally, the cost of fuel. It is not like we all drive 20,000 miles a year in the RV. When we consider the alternate form of transportation for those 3,000 to 5,000 miles the "delta" cost is not out of sight. The cost of that fuel is now more expensive for any other form of transportation - even flying.