[quote=smfinley]I can't answer the deformation over time, but remember that most boats sit on a trailer on 4 rollers.
Years ago I remember watching someone raise their main sail while the boat was on beach wheels. They were pulling down on the halyard hard enough the wheels crushed the bottom of the hull. They did not have cradles on the beachwheels, but ever since then I have never raised the sails while the boat was on beach wheels.
It occured in an unusual situation and at least 10 years ago. But in was in Santa Cruz with some high surf, they didn't want to beach launch so they rolled the boat to the boatramp and were going to launch through the harbor. So sitting in the parking lot on beach wheels they tried to raise the sail when they crushed the hull. Don't remember the boat type but it wasn't a H16 or H18. [/quote]
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