I saw one being used a couple of week age. The owner was sitting on the tailgate while the gun was in the rack. Another person sat on the tailgate and that caused the rack to shift-the owner caught the gun on the way down.
You might consider suction cup gun holders like what would go on the inside rear window of a pick-up. Just one of them mounted on a metel or fiberglass (as in RV) works very well and the barrels are locked in.
The problems with these racks are well documented above. Another is to back up a few feet for some reason and forget the guns are racked - to the ground they go. I have them and use them but with considerable care and only while I'm right there dealing with shells, glasses, et cetera. If I leave the truck, the gun(s) get moved and the plastic rack secured. I like mine in that space where you can't even get in the driver's seat without moving it to avoid mistakes....breakemall...Bob Dodd
I use one everywhere I go...made my own from a couple nice pieces of 1/4-inch cherry and 6, 3/8 X 1/4-inch rare earth magnets. Never had to worry about moving the van with the guns in the rack because the rack is on the driver's door.
Really, If you were to use good suction cups, you wouldn't have to worry about scratches or if it would stick to the car or not. But as far as I know nobody makes one with suction cups on it. Sounds like a project.
a word of warning,, in Wonderful Wisconsin the gun rests are illegal if on your car!! Not kidding. You will get a ticket if a Game warden or a cop see a gun resting against the side of the vehicle!! Paul
I have used one on my safe outside and on my truck for years,,,never had one fall of the safe,,,yes had one knocked of the side of the truck,,,s*** happens no matter how had we try ,,,mainly use to just lean it up while getting the case out and the bore snake ready
Drill a hole in it and put some 9/32" (lawn mower rewind) rope through it. Attach the rope to the inside of your truck bed or car trunk. This is a reminder that it is there, I have scattered several of these things over the mid-west.