We're from Alaska and have left our DP in Arizona for the last six years instead of running it back and forth to Alaska. We take it out of storage to use it 3 - 4 times a year, usually for 1 - 3 months at a time.
Ours is diesel, so there's no problem with gas going bad. Don't worry about exercising the generator in their hot dry weather. We've found the biggest problem is the water in the 6 volt batteries evaporating. When you put it into storage, fill the batteries to the proper level the night before and then check them when you take it out of storage.
The biggest problem you'll run into is finding storage space. In their heat, you want covered storage during the summer and it's getting harder to find all of the time. Because of the shortage of covered storage, people no longer check out of their storage space when they leave for a couple of months. About two years ago when we finally found covered storage again, we now keep it year round. So if you plan on leaving your MH home over there, start calling for storage the day you get there or even before you leave home.
And as for your question is "far away" storage possible, the answer is yes. Most of the MHs stored in Arizona belong to people who live out of state.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.