Here's the double-roller cradle drop-in that's popular in our area. The back of the trailer is fitted with a double roller set up, front with cradles. In the back, the cradle simply sets in the double rollers. It stays put, and is used for trailering and when the boat just sits on the trailer. For putting the boat on and off the trailer, you lift the back of the boat (very easy) and pull the cradles out. The boat now moves very easily on and off the trailer. Put the boat back on the trailer, lift the back and pop the cradles back in place. My modified cradles work fine with this set up too.