Here's my friend's site at Sea Pines after yesterday's downpour and tornado warning. You can see my camper in the background.
My buddy puts plastic blocks under his leveling system and we literally had to hold them in place to keep them from floating away. He kicked off a shoe to go inside and it floated under his camper.
But, the coup de grace was plugging into the electrical box while standing in 4-6" of water. (He did test it with his voltmeter before we did it- but still...)
The only good thing is this ground is sand-dirt and most of the water was gone within a few hours.