Good point about the ramp angle. Most of the ramps around me are long shallow type. We rarely get the entire trailer wet.. most of the time we just dip the back cross bar into the water and push the boat off... which is why the anti-friction strips on the bunks and roller trailers work so well up here... most of the weight of the boat is still on the trailer..we don't normally float on/off up here.
(There are a few steep ramps up here that I know of... Leonardo State marina is a perfect example. Short, steep and if you're not careful you'll put your axle off the end of the ramp. I've seen several drive on type trailers using that ramp. Then again, just a few miles down the road is the Atlantic Highlands Marina ...nice, long, shallow ramp that is perfect for roller trailers). 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
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Live simply, Love generously, Care deeply, Speak kindly.
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