This is my first post; I didn't post in the intro forum because technically, I'm not an owner yet. I would like to first thank everyone in advance for their time and the benefit of their knowledge and willingness to share!
After Christmas, I'm heading to pick up my new Albin 25 FC, which is quite run-down. It's a total restoration project. I'm traveling 440 miles to pick the boat up. I bought a trailer (picture below) which previously towed a 24' Robalo center cockpit. It is a 30' long trailer rated for 8500 lbs. Dual axle with surge brakes. From my research, an Albin 25's dry weight is about 3,500 lbs, and loaded for cruising is about 6,000 lbs. The winch on the trailer is rated for 2500lbs, which seems small to me. The boat does not have a working engine, so winching it onto the trailer is essential. Fortunately, the trailer is long, so I should be able to get the boat pretty far on before pulling it out.
Can anyone comment on the appropriate rated load for the winch?
My primary concern is the trailer's configuration is inappropriate for the hull shape of the A25. I have searched all of the A25 subsection of the forum, going back years, to find what info I could on trailers. I found two helpful diagrams showing both a bunk and a roller configuration with measurements, but both of those trailers were 24' long trailers. One was rollers, and the other was bunks. I have read that the consensus is rollers are preferred, but I have less than two weeks to get the trailer ready. Once I own the boat and have it in my yard, I can modify the trailer with rollers. To get her home, I believe I will have to rely on the bunks.
Below I am adding a diagram I made of the trailer. The trailer currently doesn't have keel rollers, but I plan to install 10" keel rollers on the last 4 cross members. The forward set of bunks should suffice for keeping the keel off the forward cross members. The rear bunks are about 5 feet apart, and the tops of them are only 15.5" above the axle. Once I add a bow roller, the gap will be shorter, 14.5" at best. I'm concerned that the rear bunks aren't high enough and that the boat will list to one side or the other on the trailer and put undue weight on the keel.
Absent any advice, my plan would be to slip the boat onto the trailer and pull it part-way out. If it is not resting on the bunks, I can put it back in the water and lash some pre-carpeted 2x4's to build up the bunk height. There's no way I will have time at the public boat landing to try and break free any hardware and adjust the bunks. I plan to use 4 ratchet straps to hold the boat in place for the initial trailering back home.
If anyone has advice on the bunk heights, it is greatly appreciated. I would hate to damage this classic on its way to my shop. I have enough work ahead of me in its current state.
Drawing:

Trailer:

