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Jim - the first photo linked above showing the dual keel rollers is of a Continental C-828/72, which is a wider, straight frame model of 2800 #capacity, and it carries my 1975 Outrage 19. The trailer under my Outrage 21 ribside is a Continental CT-944/72

Except for the Montauk trailer, I use the double keel roller detail on the larger boat trailers. Using my 4 bolt detail with the top bolts laying across the top of the frame, that automatically sets the minimum height at the transom.

To set the boat up on the trailer, use a string to set all keel rollers straight and level at the correct height, except for the front one, which may need to be higher as the keel turns upward. Set the side bunks only approximately, and winch the boat up on the trailer, with all weight resting on the keel rollers. Don't worry if it rocks side to side temporarily. First get the winch stand correctly set so the transom rests on the last roller. Now you have the boat in the correct position front to back. Then, with the boat still on the trailer, adjust each bunk to the chine line of the hull to stabilize the boat. Do one side first, being sure the boat is sittlg level, then use a transom strap to clamp it down firmly against the bunk. Then do the other side, using a hammer to tap the bunk bracket up firmly. Done correctly, the boat will be stabilized on the trailer and not wobble side to side.

this photo may help show bunk postion:

http://smg.photobucket.com/user/lgolt...4139180344

On a keel roller trailer, the bunks HAVE to be adjusted with the boat on the trailer, and yes, you have to get under under it on your back to do it! This way you will know the rollers are taking all of the weight, and bunks are for only stability. This is the secret to easy launch and retrieval.

I recommend that all keel roller and bunk bracket bolts be SS, with washers, a lock washer and regular nut. The 1/2" locknut can "gall" and freeze up, creating a real problem for you. The special U-bolts for the bunk brackets are hard to find in SS, but Pacific Trailer out in CA has them for sale.

Good luck with your new trailer. It will be worth the trip to FL.