Once when camping in the sand dunes, we had to leave the road to get our 35' into the space they gave us. We had reserved a spot, they said it would fit, but there was just no way without leaving the pavement. We got stuck in the sand in 2wd, and 4lo pulled us out with the trailer in tow. Left some serious ruts. Otherwise we would have been stranded, blocking the road, with a stuck 20K# rig and no good way to get it out. And this was after 9pm and it was dark out. I'll take the 4wd, just in case. You never know. Spent an hour after unhitching filling in the ruts.