This thread is old, I realize, but I'm dealing with same issue. We either have to power load or crank a LONG way to get my supra 21V loaded. And if I go where I can get the boat in easily then the bow goes under the roller.

It seems the boatmate trailers don't have the bow stop the correct height. Some people have lowered it, but that means major structural welding and I'm not comfortable with that, so this summer I'm going to try and raise my bunks with spacers to see if that helps.

Very frustrating. My bow is showing gel coat damage due to the weight of the boat on the roller. It's totally smashed as we get it loaded, it shouldn't be that way.