Living in Southeastern Quebec:
We considered snowbirding in the Southwest (extreme southwest corner of Arizona), and did a trial run to Northeastern Florida this February (not with the camper, but renting a condo); the following dictates our snowbirding location (in order of importance):
*a location without icing, sleet, or snowfall (however, occasional frost on the ground doesn't bother us)
*tied for 1st place: is being able to easily shoot back/forth between home and snowbirding locale (at least 3 times during November to April: 2x 11-hour days is very easy to Florida and back/forth several times; however, 2x 6.5 days to Phoenix several times during winter is completely and utterly out of the question-- and we don't and will never fly in winter locked into a commercial aircraft packed nto a sardine can with 250 potentially flu/rhino-virus infected people hacking away);
*less important is fuel prices (with our rig, south Quebec to Phoenix = $1500 return; southern Quebec to Orlando = $820 return).
So, to conclude: the distance/logistics to Southern Arizona is just WAY too time-consuming in/for our situation, unless we move to Canada's West Coast (an intermediate is the RGV, however this is a non starter with too many ice storms, freezes and "Polar Vortex" events, with the Rio Grand Valley in direct capture-target of central continental polar air movements-- events that will only get worse and more frequent in the near and middle future IMO). Everyone's situation and snowbirding criteria is different, so YMMV.