We've installed them on two previous SOB trailers. They have clips that attach to the roof vent to hold them in place. No holes through the roof needed, but you do need to drill holes through the sides of the roof vent that sticks above the roof line. When closed, the original vent cover covers the holes you drill to attach the clips to the vent. One hole per clip and there are 4 clips.
Well I installed the Max air vent cover over the week end. Funny the cover didn't come with an instruction sheet but one of my neighbors who has a 5th wheel assisted me on getting it installed.
I'm glad I went with the dark tint see through unit as it blends well with the aluminum skin of the AS. Now I need to see if Dometic makes a black or dark color A/C replacement cover. If not I might repaint it silver or black to blend in with the body.
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