Though to be honest, the more I look at it, the more it might make more sense to just rent one every few months. It would certainly be cheaper, no taking care of it, etc. The only bad thing would be having to repack stuff but I could have an "RV" box with everything I need to take. I have a "beach house" box I've been using for years that way
The only drawback would probably be being able to bring the dogs and unlimited mileage.