thomas201 wrote:
Now has anyone tried towing right at max, under the new J2807 spec? How do the newer trucks perform against the spec?
This is me. Max fifth-wheel weight rating is 9100 pounds by J2807. I'm at 8200 pounds. I use tow-haul mode and lock out the overdrive gears (5th and 6th). No problems whatsoever.
But I should say I haven't towed it in any extreme conditions. I typically travel at 55-65 mph. Largest climb has been from home into the Grey Highlands which is 1000 feet total elevation change. Temperatures in the 90s at the most.