Colby,
Your question regarding scratching was a very big concern for me. All of my big boat trailers were EZ-Loader multi-roller type trailers. If you unhooked the boat from the trailer at the top of the ramp, the boat would be on the concrete, long before you began backing down.
The new Cape Cruiser trailer has been a bear to load and unload, due to friction from the carpet. In order to get the boat on or off of the trailer, the boat HAS to be 100% floating. The down side of this is if you are at a ramp that will allow a trailer that is 30' long to submerge, you at out of luck. Usually it is the last few feet that are very difficult (and I have a very powerful 2 speed winch). If the boat is floating at the stern, then the bow is too low at the bow stop. when you pull the trailer up the ramp and the stern comes down, then the boat is aft of the bow stop on the trailer by about 1'. You have to refloat it to make up the difference, by messing with it several times.
My buddy's Melonseed Skiff is badly scratched on the bottom, where it rubs the carpet, when being loaded / unloaded, due to impregnated sand, dirt, etc. The Cape Cruiser also is scratched / well polished on the bottom from the carpeted bunks. When I removed the carpet from the Cape Cruiser trailer, I vacuumed up over a quart of dirt and sand that fell out of the carpet, (I did the work over the driveway and used a shop vac to clean-up, so that is why I know).
Two things are going to happen at the ramp with the Cape Cruiser... 1. The boat will not need to be completely floating to come off or onto the trailer. 2. Sand/dirt when the trailer is underwater will for the most part wash away and the King Starboard has a raised / bumpy profile, so minor stuff should have little to no impact.
Steve Baum
Homeport of Portsmouth, VA
OSPREY (Ex Mister Sea) 2000 22 C-Dory 2010 - Sold 3/19
OSPREY (Ex ADITI) 2007 26 Cape Cruiser 2018