We love to surf fish, and places that permit driving on the beach - from Cape Cod, south trough Florida, and around the Gulf through Texas - are our preferred destinations. Driving conditions widely vary - from coarse, loose sand on Cape Cod, Long Island, Long Beach Island, and Hatteras, to the well packed fine sand of South Jersey, North Florida, and the Texas Gulf Coast.
That being said, Daytona Beach is one of the most vehicle friendly beaches around - after all, Dayton Beach is where NASCAR got it's start - however, I don't think trailers are permitted on Daytona Beach - maybe for some special events, but not on a day-to-day basis. I am almost certain that overnight camping is not permitted.
As previously stated - the salt from the beach has to be considered, and proper rinsing and other maintenance is essential to prevent corrosion, but with proper care, a beach vehicle will last many years.
Personally, we have spent many pleasurable days driving on the North Florida Beaches from St. Augustine south through Dayton, but we always leave the trailer in the campground ....