Storage: sunny uncovered vs. salt air but covered?

[Moondoggie]

We live on the Central California Coast, within five miles of the ocean. We have an Airstream storage question and we’re looking for an opinion; think we know the answer, but trying to support it.
Read and re-read that one should not cover an Airstream with even a custom-fitted job, it will scratch etc.- Acknowledged.
We do not have storage for our new “Dream” at home, and consequently must rent a space from one of two local RV storage facilities located equal distances from home and charging the same rate.
The dilemma: One facility is approximately 10 miles inland, and although there currently exists quite a few of the very nice, professionally built and high-priced RV storage “shelters”, the storage yard will not allow new ones to be raised, and will not bend despite our pleas.
The second facility, is approximately one mile from the ocean (with its salt air), but will allow one of the aforementioned RV shelters to be erected.
Sorry, finally the question: Knowing the damage that can be caused by both, in your opinion, is it better to store the “Dream” in the sun uncovered (and relatively dry), or erect the sun protectant closer to the ocean and brave the damages of the salt air. I’m thinking with regular waxing, the inland location is the better option. What say you?

[Protagonist]

I vote for storing it in the sun in a dry climate versus storing it under cover in a damp climate. Damp means mold and mildew, which is only made worse by shade; mold doesn't grow well in direct sunlight.

The sun damages plastics due to UV exposure, including air conditioner shroud and roof vents, but the damage doesn't happen overnight; it takes years. You can forestall UV damage by painting your A/C shroud and your vent covers (unless the vent covers are transparent, of course). What? You say nobody paints their already-white gel-coated A/C shrouds with white paint? It works, and is cheaper than building a roof over your trailer roof.

The sun also damages tires, but tire covers and parking on leveling blocks to keep the tires off the pavement will help.

Even if you don't put your trailer under cover, you can take relatively inexpensive steps to minimize damage from sunlight. But you can't hide from damp even if it is under cover.

[TBRich]

I vote for dry inland air vs ocean air/breeze...even if uncovered.

[Skater]

I'd stay away from salt air for storage. That will rust the steel frame and all much faster. Better to deal with the sunlight.