[McGillicuddy]

Where is it scraping? Did it happen pre-doghouse (extra weight forward)? I have 12" keel rollers aft every cross-brace. I've also seen some Teflon caps that straddle the cross braces offering some protection. As previously mentioned, your bunks may be too low or you're not dipping the trailer deep enough. If the keel is hitting the forward cross braces you might try putting some tilted forward bunks in toward the center line to force the bow up.

Because of the riser brackets I used when I replaced my bunks, my bunks are now a bit (about 3/4") too high and I really have to get my truck tires closer to the water than I like. On some ramps I'm in the water.