I used to leave my ASW17 with a trestle under each wing, to stop them
moving and ties the tail down. I also left it in full negative flap which
meant that it would not lift.
If the wind was forecast to be more than 30 knots it went in it's box
although I was caught out a couple of times with unexpected wind speeds of
up to 60 knots, it never moved.
I suspect with speeds of 100kts you would be luck to find the glider
intact even if the tie down held, and even in the trailer it would be at
risk.