White Sands National Park preserves the world's largest gypsum dune field at 275 square miles — and you are not allowed to drive off the marked Dunes Drive
NPS rules strictly prohibit driving off the paved/graded Dunes Drive; the soft gypsum sand will strand standard RVs instantly. The under-shared truth: the 8-mile loop has several turnouts where you can walk into the dunes, but any 'off-road' adventure requires a separate permit and a true 4x4 with low-pressure tires — most rental Class C and towables are not equipped.
Source: White Sands National Park (NPS) — Dunes Drive rules and permits





