Doesn't really matter how steep the ramp is. When loading, I always put my roller trailer in until the back set of rollers is just barely under water. done this hundreds of times without incident. Get back in boat, put in reverse and back off. Go up front and unhook safety chain and winch strap. Lower motor, start and put in gear, idle is normally enough.
'Off: Back in so transom is just touching the water. Re: Roller trailers suck.What am I doing wrong?