Well, towed the 5th wheel for the first time with my new to me Duramax. This is what I observed, loved the transmission was awesome during braking. The Duramax seemed to be a little quicker from a complete stop to about 50mph from there on my Cummins is way stronger. The comfort of the GMC is 100% better, although my Dodge is a 1994 reg. cab. I guess I do have the best of both worlds, since I now have the GMC and kept the old 1994 Dodge to play with. How can I get this thing to pull better from say 60mph on up? The Edge juice?