Storing the RV for the summer

Being from Alaska we intend on snow-birding in the lower-48 between September/October thru the end of April. Rather than driving the ALCAN twice a season, we're looking at storing our RV somewhere and flying back. We intend on using our other camper here during the summer months for our short outings. Are there any recommendations as to secure facilities to store an RV for several months at a time? Are there regular storage businesses that cater to these sorts of things?

Thanx.
Ed.