Similar setup
My wife and I are taking delivery of a 2016 Cougar 333MKS. This will be our first 5er, and an upgrade from a 2012 Trail-Sport 27' bunkhouse TT. Current TV is a 2015 Ram 2500 CTD/auto, CC, 4x4, SB, ...
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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.
