I have the Kolpin gun boots on both of our ATVs, but I mounted them at a pretty steep angle to the fenders ( that keeps the barrel end down low). Since I don't do a lot of high speed travel over open terrain I've never noticed any excess vibration when a gun is in them. I will add that when the gun boot is empty and I''m using my Kodiac to disc or spray, etc. I've noticed it tends to vibrate a bit. I thought about mounting one on the Massey Ferguson so I can keep a shotgun or rifle handy for killing 'yotes; it seems I always see 'em when I'm running the tractor but they are too far for the handgun I carry for snakes!!!!!!!!