Originally Posted by henryfreston
It is not so much the shaft length more the depth of the hull if a searider which means you would hav to push the trailer out further. We don't have a proper 4x4 just a Nissan quashqui so reversing the trailer out isn't a possibility!
If you see what I am saying?
If it really needs to go deeper:
(1) For launch you can usually "walk" it out with a small boat/trailer.
(2) For recovery you can use a rope.
(3) If it is regular enough to be a pain (e.g. your normal launch) then consider an extension bar on the trailer tongue. There are commercial versions but a scaffolding bar, hitch and ball can be bodged up for very little.
If the trailer has rollers you can get away with surprisingly little water. If it has bunks you will need a bit more, but I have a 2wd family car and launch a longshaft transom (3.9m) with nothing more that a rope without my back wheels or any other part of the car touching the water. I use a rope quite a bit for recovery but can usually get the boat OFF the trailer (on bunks at the moment) without unhitching the trailer.