I just looked at the park on Google Earth. The RV park is a long one-road strip of nice looking Park Models interspersed with RV sites.
The storage lots are also a long strip of parking (uncovered). One of the lots is at the corner of the busy Apache Trail Rd and the other side borders Ironwood Rd, also busy. The second RV storage is next door at Ironwood & 4th.
So one side of the whole complex is along a highway and the other side is the RV park and to that side are nice homes - with pools.
For $30/month you will not get a covered spot and $30/month is very cheap. There are approx. 70 RVs parked there - of all sizes and about a dozen boats (there are lakes nearby - yes, in Arizona).
The OP needs to go there and check it out himself and compare it to other storage facilities. No one here can say if it's a good or bad deal.
As far as the office manager not giving a private tour, I would imagine she's the only one in that office and can't leave readily. It's not a real big RV park to have more employees.