The humps at the end of the ramps are not caused just by powerloaders , typicaly a motor blowing silt from a launch will move it well away from the ramp , in fact if you didn't have guys running there motors while loading you would find that to get your boat off a trailer you would be up to the door handles , If you doubt this go to Picton /wellington or any launch and watch what the waves do to the shore , waves pick up any loose sediment and move it out , next wave does the same thing , walk the beach and you have 2 ft of water close to shore go out 30 ft and you have a sand bar ,at launches Trucks , trailers and cars all backing into the water loosens the dirt and sediment and mother nature puts it all in a hump right where you don't want it to be when the water is dropped every fall , if you don't like the launch the way it is , take a rake and fix it , don't blame others ,as for county maintained launches good luck