2006 Dodge Ram 2500 Quad cab diesel SRW short bed. Bought the Hellwig before our 8,000 mile trip. Did not fit at all b/c of our after market HD hitch (I'm going by memory here and DH is asleep).
There was nothing in the literature that said anything at all about this and we did research it.
All I know is that after many calls to Hellwig it was confirmed that it won't work with an after market hitch and we had to ship it back at our expense. It cost us a $100 shipping and ??? for the insurance. it was a real PITA. Still waiting for time and money to install a Roadmaster.
Oh, and the shipping from whatever co. we bought it from was ridiculously slow - like weeks. Can't remember all the details but I believe that the seller was waiting on the factory to send them one. Took numerous calls to Hellwig to get it sent. I could have driven out there and back twice from NY for the time it took. What a hassle all around.