My niece has lived with us on/off her entire life and we have been big into Rv'ing since she was a baby. She is now a Sgt. in the Marine Corp and has gotten married while she was in the GA area. Her spouse is employed in GA, but she got stationed for the next 2 years in NC. She purchased a 33' TT for her and her 2 dogs and has been set-up on base at their campground for the last 4 months. It has a bath house, laundry, etc. for $500/month, which includes lot rent, electric, water, sewer and WIFI. The going rate on a 1-bedroom apartment was in the $1200-1400 range, so her thinking was that she would get 2 years worth of camper payments, pretty much paid for with her housing allowance.
Her only problem has been the last few days since it's been COLD, COLD, COLD there. It's supposed to warm up this coming week.
So, my point in all of this....it is a good idea in some cases. It sounds like you are doing all the pre-planning and checking off the pros and cons.
IF you can find someplace to park it that is reasonable, this might be a good idea for your situation.