I went through this with my car last year.
If like me you only tend to use it between April-September then just keeping it clean and spraying some water displacer/anti-corrosion e.g. Ferrosol may be enough?
On a related and hopefully relevant note, you can buy cheap USB borescopes for your smartphone/tablet for about £20, which would be useful in keeping tabs on rust in cavities and other inaccessible areas.
HTH
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