I have an ARE on my 2015 2500HD and I’ve been happy with it. It has the roof rack on it w/Thule hardware.
I’m certain my experience is in the minority, but I had a horrendous experience with ARE customer service; the frameless rear door wasn’t aligned at the factory & chewed into the fiberglass. Dealer worked with ARE to ship it back; 6 week turnaround time. 2.5 months later the topper showed up back at the dealer with damage to the top of the topper. ARE claimed it wasn’t their issue despite me having pictures of the top of the topper prior to shipment. Dealer worked with ARE for several months before the dealer decided to make it right out of their own pocket.
I was thankful for the dealer (LineX in Fargo), but ARE was far from great to work with.