Not many 30 ft boats can be on a trailer.. at least not the type cars pull. From around 26ft up most are lifted in slings to and from the water. Or some yards use a hydraulic trailer. Boats need insurance!
J/30 certainly doesn't seem to be "trailer-able" What's a "ULDBs".?
Unless you are looking at Marine facilities that do not have yard storage you will never need or want a trailer. this is what/ how it's done at most marine yards. (sales promo, No involvement on my part)
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