You could set 1 up with 4 like 3" round steel poles on 4 corners then you have a winch that pulls it up and down

https://www.jetskifloats.com/jetskidockinstallation.htm

That's just for jet ski dock, But similar design for boat dock ,
My mom and dad used to rent a cottage on Lake Travis,
And it also had a boat dock also, 20 foot walkway, was on wheels
But was also easily unattachable, from the u-shape.boat slips.
It was a walkway with a U shape deck/slips
you can put one boat in the middle, one boat, on each other side,
It had four 20-ft poles, on each corner of the main deck of a u shaped deck
With four winches, One for each pole, with The cable,
Attach to the bottom of poles, So you can raise it up and down as needed 👍

Hard to imagine with the Guadalupe and LLano Rivers flooding like they were that Canyon and Travis didn't rise more. Did TEQC make them open the gates? No rise at all at Choke Canyon or Lake Corpus Christi. Business as usual. IslandJim

We caught 7 feet in Travis, and yea, I expected 10 feet or more. But, hey...we'll take it!!

Talking to my contacts in Del Rio - all say it's a 7-10 year project.

And if it takes that song - so be it. We just need the water at a constant depth so the grass will grow. But that means we also need some rain.....

Yes I was hoping for more also,
But just 26 ft to normal pool,
And 39 ft. To full pool level 🎣🤟🎣
Let it rain let it rain let it rain 😉🙌🎣

http://www.laketraviswaterlevel.com/