Agree with piemaker. They get really hot in direct sunshine (even in cool latitudes) and in the winter time they condense and drip like mad. My father kept his car in one for years and it was (is) covered in immovable rusty stains where water has dripped onto it. I would never keep a vehicle or anything else important or valuable in one!
Plus unless you deflate the tubes a rib won't go in easily (or at all) anyway.
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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