New generation Gm and camper fit.

Just bought a new GM a month ago and finally had good enough weather to throw the camper in. They've changed the box dimensions again and i had to add 2 1'4 inches to the bottom of the camper to clear the On Star antenna and get it over the rails. It would pay to be careful and measure before. I did notice the differences in the wheel wells clearances and the box before hand so I was careful enough not to hit the antenna. My camper is a Star Craft Adventurer and 21 inches drom the bottom to the over rail part. I don't know if all campers would be the same. Just thought a heads up was in order.