camping on the beach

Grand Haven SP would be the place to go, since it's on Lake Michigan. No salt, no sharks, no worries! (Yes, I have the t-shirt)

Not clear what sort of beach the OP is talking about.
Ocean beach? Great Lake Beach? Smaller Lake Beach?
I think the answer is Yes, Yes, and Yes, based on the responses.
There are several campgrounds on the Great Lakes that will get you very near the beach, although you probably would need flotation tires and a dune buggy as a Tow Vehicle to not get stuck, as most Great Lakes sandy beaches are not hard, but very soft and deep.

For the sake of your equipment you really really do not want to be on a beach. It won't show right away but your stay will haunt your truck & trailer years later. Both are made with & fastened together with materials that do not do well being exposed to salt water or salt air.

Pick a location with mostly offshore breezes.

In Michigan, Grand Haven state park campground is right on the beach, paved pads, all sand, no shade.

1320Fastback wrote:
Oceana Dunes "Pismo, CA" comes to mind.
Like other places it required a inlet crossing so paying attention to tides is vitally important.

Also Wrights beach just north of San Francisco has beach spots available.

I really prefer parking just inside the trees on the beach...

The main reason is to stay out of the Beach traffic that seems to keep going throught the nights... It is also just a tad cooler...

Roy Ken

Brazos island state park https://roadtrippers.com/us/brownsville-tx/nature/brazos-island-state-park East of Brownsville, TX

Oceana Dunes "Pismo, CA" comes to mind.
Like other places it required a inlet crossing so paying attention to tides is vitally important.

Do you need hook ups?