I agree that bunks support boats better, but it depends on the ramps in your area on your need. 
Some ramps in my area will not have enough water to float your boat on or off the bunks, meaning you need to wait for the tides.
I use a roller trailer, and on step ramps can be interesting to watch the boat fly off the trailer!
Both have there +/-
and if Skools did not have all them trailer queens down there he would not have the ripples!!
