After having my car sliding from a slippery ramp half into the water I thought it was time to make a trailer extension to be able to get only the trailer and not the car in the water.It's put together with some galvanized steel square tube and an extra trailer hitch ball.
The extension has a reces at the far end which slides over a bolt in the tongue-assembly (the bolt is the rusty bolt near the parking-brake-lever). The extension bar locks on the ball by just lifting up the car-end of the extension.
To carry the extension there is a ball on the trailer and a u-frame on the first crossbar: the back end of the extension lies in the u-frame and the front end is fixed by clicking it on the ball.
It works, although I always find the forces on this kind of equipment a bit daunting. Especially when the trailer is half way in the water and the back of the boat is already floating, the forces on the front end of the trailer which carry the rest of the weight of the boat must be quite high.
Next: antifouling with finsulate wrap.