[PaulK]

If you could post a picture we might be able to understand the problem better. It is usually quite simple to lift the bow of a boat on a trailer up by using a car jack with a wooden chock and a cushion under the stem area. This should lift it enough above any forward trailer pads to get a brush of antifouling there, while the stern pads hold it steady. When that’s dry, the same technique will work with the stern.