3500 Dually, Cummins HO with Aisin and air suspension. Got one...enjoy towing with it. It feels way more capable than my 2500 standard Cummins SRW short bed did with the same 5th attached. They both were 2022 Laramie's. I simply wasn't as confident or comfortable putting that much trailer behind a 2500 SRW short bed. With the 5th wheel pin weight as-towed along with passengers, I was considerably over rated payload for the 2500. Many will tell you that's a marketing CYA payload rating, but then I'm an engineer by trade and tend to have an insatiable desire for 'margin of safety'....so there's that. So I traded the 2500 with less than 1k miles for the 3500 HO. Fixed my margin 'issues'.