I was concerned about this when we started looking at the Vegas or Axis. Have had no scraping in 21,000 miles, but I do stay aware that that is a low point on the coach. There is a hump inside the gate at our storage lot, and it doesn't clear much there.
There haven't been many forum reports of damage to that thin fiberglass under the door, so that's encouraging!
May the trails always twist in your favor
May the tales always end in good light
May you have more friends than one campfire can hold