Another to remember and think about if towing. "ASSUMING" your new tow rig barely meets the new tow rating, ie min grade pulling is 12%, 13% you have stalled out. How well will you do in Yellowstone National park where there are 15% grades to go up? Yep, you may be at or slightly under the tow rating, but you will not go up that hill! To fetch a pail of water, only fall down and break your crown.
I learned this lesson MANY years ago, to never trust a tow rating to meet the spec "I" need a rig to do. You can find formula's online that can tell you based on torque, gearing in trans, axle, tire diam and road surface the speeds, % grade you can go up. Then figure out if a given rig will meet or not meet YOUR personal performance standards.
The N-Ga-Neer specs per manufactures, suck! Too slow on a 6-8% grade by 5mph, and less than a 1/3 of the min grade I have needed to pull! Do I trust them, sorta kind a, but not really. With the newere 6-9 speed transmissions, lower overall low gears in trans, most rigs today are better than the ones I blew up 20-30 years ago when starting out pulling trailers. I still have not figured out why my 81 GM C2500 with a 292 I6, muncie 4 sp was rated GCWR wise at 8500 lbs, but was in an 8600 gvwr truck. You could find the same drivetrain in a 1 ton dually at 10K gvwr. It could pull 12K up a 20% grade. Meanwhile the 89 R3500 dually with an almight 454, th400 auto trans, stalled out on that 20% grade at 12K lbs, with a 16K gcwr! C2500 went down the driveway, hooked a chain to the R3500, pulled it up that hill. The next day the R3500 got a new trans at 35K miles, first of 3 that were replaced every 30-35K miles like clock work!
Just because it has a higher rating, may not mean it is the truly better tow rig!
Marty
92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
2014 Chevy 1500 Dual cab 4x4
92 Red-e-haul 12K equipment trailer