this 2500 vs 3500 is B. S. in single wheeled trucks. the only difference in them is an overload spring on the 3500. my 2500 needed air bags to help level out my added 2500lbs pin weight and my buddy laughed and said should have bought a 3500. so i asked him to hook my trailer upt o his 3500, and it squatted nearly as much as mine and he still had to install air bags to level the load. LOL. if you know anything about weights and measurements and are smart enough to load your trailer correctly than you should have zero issues. and for jelag you should do some research on brake controllers and see why people who haul in all weather conditions don't use a delayed controller. they aren't that safe and can be a handful in snow/ice conditions.
like i said this is a touchy subject to some... ... ... ... .