Re: Similar setup

Probably no help to you but we have a 2010 Ram 3500 CTD 4x4 megacab and tow a 39' Keystone Alpine (dry 12.5 k loaded 13.5) and our pin is 2680. Even with one ton springs I added air bags to level the rig and Bilstein 4600 shocks to counter the porpoising ( chucking) on the interstates and the ride is now great. BTW have B&W companion non slider for over 10k miles towing.