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As Denise said, few 30ish footers will be on a trailer, so at this point I suspect you're worrying about nothing.

Should you actually find a boat with a trailer and don't want to store it, I'm sure it (the trailer) would be an easy sell, especially if it's a boat that is truly practically 'trailerable' - but again that isn't going to apply to a whole bunch of 30 footers...

 

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.... What's a "ULDBs".?......

Ultra Light Displacement Boat

 

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Lighter, of course, than non ULDBs but by that size the beam limitation is usually the bigger deal for routine towing - Ford, GM and Dodge etc will be pleased to sell you a tough enough vehicle!

I think having a suitable trailer for your boat would be a big advantage come storage, project, rehab times - yard daily fees add up pretty quick. But not having anywhere to store it between times would be problematic.