I think you can never have too much truck for safety and reliability.
Towing an 8000 lb trailer with a 1500 and then with a 2500 or 3500 provides greater stability during unusual conditions and situations. Curvy mountain roads, extreme stops, wind/weather, long and steep grades or downhills, the more truck the better.
I started out with a Dodge Ramcharger, moved up to a 2500, then a 3500 and now have a 4500. I have never felt safer or more confident when towing now that I have the 4500. No more white knuckles on long steep downgrades or in panic stop conditions.