The only serious squeeking we've had was in our TV. I ended up opening the TV and installing felt pads throughout inside it where metal squeeked.
Our rig had a significant "Banging" problem on rough roads from day one until a couple years ago when I put similar thick felt pads on the bottom of the roof-top antenna feet and it's wings. No more banging.
Sold everywhere like grocery stores, Walmart, Home Depot, maybe even in truck stops. Trim to whatever size & shape you desire. They have an adhesive backside.