Winnebago uses snaps. A single insulated curtain the full width of the RV, six snaps, three each side of the opening to the cab. Snap bases are screwed into the wall.
Velcro is inappropriate because the forces are in the wrong direction, but velcro, especially adhesive back, is a low cost solution. Don't have to pay someone to locate six snaps using a template, and screw each one in. Also, location of the velcro does not have to be exactly right, as is the case for snaps, so a few minutes more labor saved.
Snaps would be an easy retrofit, figure out where to put them on the curtain (installation is a press fit) then use the curtain to locate the bases. Doesn't need to be as precise as it does for mass production.