Sounds like a good plan. I just recently had an epiphany regarding storing my a126. I realized that if I put it nose down (tongue 2.5"s off the garage floor) that I can remove the battery, tongue jack and propane tanks and pull my jeep up over the trailer tongue, gaining the needed space to fit my camper in my garage. I have 1" of clearance on the back wall, 1" of clearance between the front of the camper and bumper of my jeep, and slightly less than an inch of clearance at the rear of the jeep to allow the garage door close. Note: I'm not driving on the frame of the tongue,, the Jeep has plenty of height to clear it.
So I have a dry non-freezing storage spot now. I still plan on putting some dehumidifying stuff in the camper (similar to what you mention, different brand from china-mart).
2011 FR Rockwood Premiere A126 Hard Side
TV=2011 Jeep Wrangler Sahara 2 Dr
Reese 66065 WDH, Curt WDH Shank #17120
Prodigy P2 Brake Controller, Mopar 7-pin Harness
B&M Transmission Cooler (#70268)