From a little research and experience, it appears on average that Siloam Springs, Ark and Charlotte, NC enjoy similar temps throughout the year. That said, winter RV life is quite doable in the Charlotte area. The average low runs around 31° at night, but warms up during the day. On occasion, temps can drop down into the teens during a hard freeze.
My camper is 4 season enclosed with heated tanks. During a Charlotte winter, I would typically use about 30#s of propane per month for all but my shower needs. The modern heated bath house had plenty of hot water that I didn't have to heat. Not to say I always enjoyed the stroll and on the coldest mornings, I showered in the rig. I used a ceramic heater to augment the furnace and of course a heated mattress pad for sleep. Some nights, I had to disconnect the water hose and run off the on-board water system. But, I spent several winters there due to work commitments and was very comfortable.
Interesting to note that an older couple camped there during the school year, as they both were school teachers. When school let out at the end of May, they and their MOHO were history until the end of August rolled around. The rate back then for seniors was $300/mo FHUs and free WiFi in the nice county park. The senior/non-county resident rate today is $26/nite.:( A monthly rate at a commercial park is far cheaper.
MOHO or Tag along is entirely up to you. But, a used Arctic Fox TT could be towed behind a 150/1500, a small comparable 4 season 5er behind a F-250/2500 without incurring the added expense of two drivetrains and subsequent maintenance. Good luck with your research and decision.