One comment:
A metal motorhome, like ordinary cars and trucks, is a Faraday cage that will protect the occupants from lightning strikes. A fiberglass motorhome provides no protection whatsoever. People pulling trailers are told to leave the trailer and take shelter in their tow vehicle until the storm passes. You apparently won't have that option, so you would need to take shelter in some nearby structure. Or stay and take your chances.
This may or may not be significant to you. But I figured you should at least know the danger is there.