Here’s a few more cents…. I have owned the following:
16′ Sea Nymph on an unknown generic bunk with center roller – hard to unload, requiring me to back way into the water and float the boat off. Just ast hard to put back on “dead center”
19′ Wellcraft on Shore’Lander roller – Not too bad
25′ Powerquest on a custom bunk – Unbelievable, self launched many many times and always self centered when re-loading. Usually powered the 500HP off the trialer. I was spoiled and I never understood what took other people so long at launch ramps until I owned my next boat:
18′ Crestliner Sportfish on a Yacht Club roller – worst combination (one of the reason’s I sold the combination). Very hard to get on the trailer level and difficult to launch by yourself on steep ramps.
20′ Lund Pro-V on Eagle custom bunk – outstanding! Self centers no matter what when loading, even in swift river current.
As a result, I would buy a custom bunk trailer for any boat I buy again in the future. They may be a little harder to launch in shallow water, but loading is extremely easy.