Just to give you another line or reasoning, I have a roller EZ Loader trailer for Journey On and I feel it's the only way to go for the type of launching we do. It handles all type of launch ramps,; I can wind it up by myself and everything is centered. I've had both bunk trailers and this is my second roller trailer. Those who knock roller trailers might not have ever used one.
As to your adjustment, I'm not sure what the problem is. Both of my trailers came from the dealers set up correctly, one for a C-Dory and one for a sailboat. So they can fit a variety of hulls. Actually the boat dealer didn't set them up, the trailer dealer did.
Since you're in Maryland(?), here's the distributor for Maryland:
EZ Loader Mid-Atlantic, Deale, Maryland: 410-867-3926
ezma@ezloader.com.
Servicing dealers in MD, DE, NJ, VA, West VA, PA, and Long Island, NY.
I got a lot of help from the Washington Distributor, so try the one in Maryland. Remember, they want to sell trailers, so the should help.
Also, here's the customer service number for EZ Loader Adjustable: 800-398-5623 It's the factory, so they should have answers.
There are 3 dealers in Maryland. I'd contact one of these:
Tri State Marineor
Guy Brothers Marine or
Amp Marine. If one of those is your problem, try another, I feel those trailers are worth it.
Again, I think roller trailers are the way to go. I know a lot of C-Brats don't agree. However I can think of a number of launch ramps that I could not have used without rollers: San Francisco, Spanish Ontario, Dubuque, etc. The boat always was self centering, and came nicely out of the water.
Boris