I was mulling this over and I think a
simple winch with hook that secures the come-along to the floor register hole in the floor opposite the slide room. If there isn't room for the winch next to the floor hole a short strap could be used. I don't know how the winches for bedroom slide is made but I suspect the same come-along would also work.
This might even work, plus have other uses:
https://www.harborfreight.com/automo...ler-30131.html You'd have to make a flat hook to attach the winch to the floor register hole.
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"We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln