M_Boats: Trailer Set Up

I have had problems retrieving the Boat on the trailer of not getting on the rollers for proper support. I have bunks and 3 rollers for keel support along with a Keel guidance system copied from one of the MON articles. On my previous boat a Person 23CB I had a bunk that supported the keel. What is common on Montgomery trailer set ups? Has anyone had experience converting a M15 trailer to a keel bunk support? Pros,Cons George "We Can Not Control the Wind But We Can Adjust Our Sails"