Let me see, you have a $50-100k motorhome that is completely at your mercy . . .
You would kinda hope that if you were dumb enough to sink a motorhome that you would pay for everything, but the tow operator was dumb enough to sink his own stuff.
As to salt conditions in July, because the salt could be absolute perfection two days before you arrive and rain could put everything under water the day before, you won't know until you get there.