I also have multiple boats & multiple trailers. My solution for versatility is to install a 2" straight roller on each side of the rear trailer beam that is 17.5" long. (Rollers are 13.5" plus 2" endcaps on each end). Once the boat is on the trailer, put a cradle under the rear hull that fits over the roller. The cradles also fit the cat trax axle and the 2" trailer beam in front. (These are not the Cat Trax cradles) Because the cradles are not attached, I can move them in and out to accommodate boats of various widths. The 2" straight rollers are available at West Marine, Bass Pro and other boating / trailer supply stores. Shipshape makes the rollers in 9" sections. Get 3 rollers and cut one in half. Use 1 and 1/2 roller on each side with endcaps.