Originally Posted by The Jackeens
its easy realy ,
undo the main brake rods that run down the center, raise the wheels clear of the ground by blocks under the frame, undo the U shaped nuts/bolts that hold the axil and wheel guard to the main frame 6 in total( i think ) slide the axle forward by the same amount on each side, resecure the axle and brake cable.
Axels are usualy fixed to a length of angle which is clamped to the frame by "U" bolts as Paul says. Just slacken the nuts. No need to take the nuts off.
It is a good idea to mark the original position of the angle on the frame with a permanent marker before you start.
It is a long winded exercise, but not difficult. You will need 3 axel stands or other supports and a trolley jack.
Move the axel a couple of inches (cm) each time, nip up the nuts, lower the trailer and try to lift the hitch with one arm. Keep going until you can just do so.
Make sure the boat is set up as it would be when you tow, fuel tank full/empty, engine up/down, kit bags stowed etc.
the hitch weight move the axel foreward
. To increase
the hitch weight move the axel backwards
Measure from the ball hitch to each side of the axel to make sure the thing is on square. Otherwise the trailer will crab sideways. i.e. it will stick out further one side when on the road. Pick a feature on the axel like the fixing where the axel attaches to the angle iron to measure from.