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I recently bought a Karavan bunk trailer for my Montauk 17. The dealer that sold it to me insisted that no roller is needed for a Montauk and he's sold hundreds like this with no complaints.
So, it rode real bad with the bow bouncing around so I pulled out the original manual for the boat which recommends the bunks are only for support and the bulk of the weight should sit on a keel rollers. I added bow and keel rollers and now it rides much better.

Mine also has a U shaped frame so I had to lower the height of the bunks so the hull would sit on the roller. The only other way to do it would be to add a strait galvanized cross bar which I may do. The way it is now I can lower the engine so the keel touches the pavement but as long as I remember to raise the engine when I pull the boat I should be okay.