Dustydog said:
...40 years ago Scott’s stabiliser was the best.... They also did another function that the Al-ko doesn’t,. They had a massive cart spring which under tension helped nose weight. I am not convinced this did anything but the theory was there
There used to be three or four makes of blade type stabilisers, I couldn't confirm the Scott's was the best, but it was probably the most successful of the genre.
Helping nose weight? not really, The action of the leaf spring was to make the vertical articulation of the hitch more resilient, this would tend to lift the hitch by by virtue of the reaction between the spring on both the car and the caravan, and try to straighten the vertical beam of teh outfit it would tend to unload the cars rear axle by a few 10s of kg, and increase the load on the front axle by a few kg. it would be barely noticeable on the front axle.
It would also increase the load on the caravans axle by a small amount.
By virtue of raising the caravan's nose it will tend to reduce the apparent nose load.
This raises an interesting issue that I had not previously considered. When measuring a vehicle on a rolling axle gauge, or on a flat bed weigh bridge, all stabilisers should be released so the hitch is as free to articulate as possible, otherwise the stabilisers frictions or spring reactions could cause incorrect loads to be measured.