I have guid on's with lights like these, THIS IS NOT ME!! I never woukd get that deep in the water and I have a 23 footer!!
West Marine and, I am sure others sell Self Centering Rollers also, I know a guy that swears by them.
It the bottom roller in this picture. And as spare said we can help you convert to bunks if you want to!! There are plenty here and other places that have done it.
http://www.westmarine.com/webapp/wcs...2#.UG-DBpjA8l9