I think Clorox would be your best bet. I can't imagine the campground wouldn't come through and sanitize everything after the floods though.
I know Buttonwood, where the M&G is held, has some flooding issues on their river side of the campground. They get a team together and move all the trailers to higher ground when it is expected to flood bad so that nothing is lost. I'm not sure what they do to sanitize though.
That's something to keep in mind though, ask if the campground has an evacuation plan if there is another flood. If they don't have a team of workampers or employees to help move them, do they have a call list where they call all the renters to move their stuff in the event of a flood?
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR