I checked it out last night and Salsa does stick to velcro. It sticks, but unless you stepped on it??? it's a very small area of the line that can come in contact with the velcro. I tried it on a glove, but I think I have a roll of 2" somewhere. You would probably need a 2 or 3 inch wide piece or a significant length of narrower velcro to be effective. Maybe a 6 by 6 inch patch would work, something big enough you can pile the sheet on to. Or how about a thin strip all the way across the rear, and/or center of the tramp? That's where the sheets are going to slide, to the rear or center.

good idea David