Not sure if you want a reply from Lutz but I have used the Alko for 3 years and as a total sceptic am very pleased with it.
I could not accept that gripping a 50mm ball would damp a ton plus of caravan but it does.
I have not used two stabilisers for the last two years and I am hard pressed to tell any difference
The BIG advantage is that its quick and easy to operate and there are no parts to stow away and there is no greasy ball for little fingers or trousers to get on.
Big lorries and coaches now pass and we only know that they are passing when we see them .Almost all suction and swaying of the caravan seems to have become a thing of the past.