J-F M

I have a 2020 2500HD Sierra SLE. Since I got it, it pulls to the right. Dealer aligned it, was still as bad. They changed the Stearing box. Was better but still pulling to the right. It it's even worse when I'm towing my fifth weel. Now they said two tires are bad and they changed them. Just got it today and I find it still pulls to the right. The truck only has 8200km (5095 milles)They gave me all sorts of explanations that don't fit right for me. As I can see in this forum, I'm not the only one with this ongoing problem. Is this a bad truck? I had a 2011 1500 Silverado for 9 years and never had any problems with it. Anyone has idea of what might be the problem?