To post pictures, you need to use the "",[/b] not the "[b][[u]URL[/u]]"[/b] command. The photo is best put in your album, and that address linked to what you want to display on the forum. Photos have to be in one of the stardard formats, and [b]jpeg [/b]works the best on this forum.
Looking at your avatar it appears that you do not have an album. Ask TyBoo or DaNag for an album, and you will be set to go.
This is even more of an issue in the C Dory 25, where it barely fits between the fenders of many trailers. Normal "PVC over pipe" guideons do not have the strength to center the boat. They are visual aids. I make sure the boat is centered when Marie drives the truck forward to "Set" the boat's position on the trailer.
This whole problem is worse if you are power loading (which is frowned upon at most ramps.