Here are the ones I know of and have done it personally:
Anchorage, AK
Bakersfield, CA (more like an hour)
Victorville, CA
Fresno, CA (more like an hour out)
Palm Springs, CA
San Bernardino, CA (about 1 1/2 hours from the whole East end of the LA Valley)
Flagstaff, AZ
Phoenix, AZ
Tuscon, AZ
Yuma, AZ
Colorado Springs, CO (closer to an hour up a big mountain)
Daytona Beach, FL (more like an hour)
Ocalla, FL
Asheville, NC (more like an hour out)
St. George, UT
Las Vegas, NV
Reno, NV
Of course heat and cold will be an issue but if you are in an RV with a furnace and generator and AC that solves that. A bigger issue will be time limits. In some of these places the 14 days are strictly enforced and some they are not. For example the Ocalla NF near Ocalla and Daytona Beach is pretty strict.
Nearly any big town with a NF or BLM desert land withn an hours drive you can do it.