what exactly is a RV that is "4 seasons ready"?

If you're going to use the camper to go skiing in cold climates, for instance, you'll know exactly what that designation means: All pipes and tanks are enclosed, insulated, heated.

Here in the Angel Fire (ski area in New Mexico), mid-winter temps will run in the teens during mid-day/afternoon and well below zero at night. The water systems in non-winterworthy rigs will typically freeze up within several hours of arrival. The resulting damage can be quite ugly.

Lynn