I have spent the entire morning researching a 5th wheel hitch for my soon to be delivered GM 2500 Crew Cab Std Box Denali. I have spoken directly with multiple 5th wheel hitch manufacturers including Curt which supplies GM. The puck system on the 2020 is different. A 2019 hitch will not fit. Everyone is telling me a month. I am not taking delivery of my truck. Everyone who is planning on pulling a fifth wheel with a new 2020 better consider how they plan on attaching the 5er to their new fancy truck cuz unless your gonna use rope or bungee cables I am not finding a solution. Maybe if enough of us refuse delivery, we can prompt expedited handling of the problem. Who the heck at GM makes a change like this and not give the info to the hitch manufacturers in time so there is a hitch available when the truck hits the market. I sure hope this is the only surprise.