Select to expand quotesailquik said..RAL INN said..
The driver of it told me that they provided lift and ideally they would get hull clear and as each 'fence' left water the lift would self level.
But it seemed every time they ran it when I was there. They cavitated or ventilated and lost steering.
Ahhh, interesting. I had lots of long conversations with Tim but he never told me that. 
I like the idea if it could work though. 
I only had 2 conversations
one was the question and answer as above.
the other asking me to get off water 5 minutes before they started a run.
