Thought I would put up a few snaps of the recent refurb I did on my Brooker tandem trailer. It was a pain in the a%$e at first. Not really what you would call a drive on as the rear cross member had the keel roller in the centre (as you would expect) and the wobble rollers off to the side of this. If you missed the keel roller and fell in between the keel and wobble rollers it was fibreglass on metal. Gouged my hull up pretty bad a couple of times.
Solution: Get rid of the rear cross member and install a lead in section. Works a treat now and can launch and retrieve solo quite easily.