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Florida has been touted as a place to find commercial campers and RVs. Retirees from the NE plan to RV together in that warm state but either change their mind, upgrade to another RV, or stop RVing because of health or age reasons. There is no ice in Florida (hence no road salt) but do look for rust caused by salt water breezes or drives on the beach.
The American Southwest is another good place as there is no road salt. Paint can be degraded by “sun fade”1) but that is cosmetic rather than functional. Tires can be dry rotted and dashboards and interiors sun-damaged.2)
Colorado does not use road salt, relying on gravel instead. Locals advise that cracked windshields from gravel are to be expected.3) 4×4 campers may be more common in mountainous areas.
Vehicles that have not been on the beach in California will be in good condition but will generally be more expensive4) and may have complicated and MPG-stealing smog abatement.
Some states in the northeast and northern midwest use salt on the roads to melt ice.
Colorado and Utah use non-salt chemicals or gravel on the road.
Alaska is too cold for road salt to be used there.