If one could assume that the stringers are fiberglass, and not wood ( which
would probably be rotted away by now)...it sounds like you have little to
lose no matter what method you try.

If she were mine, I'd drill a number of smallish holes at the lowest
point(s) of the bottom and see if water drains out while on the trailer. I
wouldn't hesitate to add a SMALL amount of air pressure with a small
compressor..however I doubt that you could keep the pressure on for long
without burning up your compressor machine. The prevous post describing
using a wet/dry vacuum adds another method of drawing the water out. It may
well take months, but heck, it IS Winter in most places.

What brand of hull is it???

RichG