I have my coach stored outside. It is much cheaper than inside storage and the rig is made to be outdoors. Sure inside is better, but expensive and the rig will not last forever. For the first 5 years our rigs got only weekend use. For the last 5 years we use it about 5 months a year. I did not have any non use falling apart issues during the first 5 years.
Tires are the main thing that age out through non use.
2007 Fleetwood Bounder 38V