Definitely aware of the way salt eats away at everything. One of the reasons I did not want an outdoor kitchen!
I was already inventing a PVC contraption with two sprinklers that I could attach to city water and slide up beneath the undercarriage to wash off the sand and salt. Have pressure washer, extended soft brush scrubber, and ladder ready for cleaning EVERY time I return. I can't stop the corrosion, but cleaning thoroughly and spraying exposed metal surfaces with WD-40 is about all you can do. As well as paint every spot you see immediately.I was going to take a good look underneath and see what extra efforts I might make at sealing and
weatherproofing, once I made the final decision. I assume after crawling underneath I am going to find some areas that could use repainting to cover exposed metal somewhere. I want to be very proactive on the underside of whatever rig I buy. As an ounce of prevention beneath is easily a pound of cure from a rust perspective in areas that are not visible easily.
But you guys are right, in that ultimately salt wins.
As for the danger, in Corpus/ the Padre Island National Seashore- that was a weird deal where the poor folks befriended the wrong people and moved from the RV park down to the National Seashore agreeably and together. It was a tragedy, and none of the folks were locals. That being said I wouldn't boondock anywhere remotely without being armed. I was down in Port A right after the Hurricane and the beaches all were spooky and remote seeming. Without anyone for miles on the National Seashore I always plan on having a gun handy especially at night.
If you ever want to know what is going on on the coast you can take a look at Islandmoon
to see pics of the water, beaches and they have a crime report every week. Mostly very boring indeed beyond thefts of opportunity. Here is beach cam link to Malaquite beach which is near the RV park in the National Park. It's got salt spray on it a lot of the time, but it shows the conditions and I like to look at it and dream of my new camper putting me there. https://www.nps.gov/media/webcam/vie...91DCA0B089397B