I used to do " Dealer Trades" for our local Chevy dealer. on one trip I was bringing back a new Chevy 2500 HD diesel for the dealer. Driving north on I 75 I was behind a pop up with several bikes on some sort of carrier. All of a sudden there were bikes bouncing all over the interstate. I was dodging and weaving, didn't recall any strange sounds, but got off at a rest stop that was just a mile up the road. Somehow there was no damage to the new truck. Sure glad I didn't have to explain how I brought in a new truck with a bike embedded in the grill.