Towed our fiver for the first time with the new truck. WOW! This truck continues to amaze me. Created a "new trailer" in the truck apps screen, Adjusted the brakes and White Lightnin' takes over and remembers the brake setting for it and keeps track of the miles. South on 75 into Tennesee and up Jellico Hill at an easy 70 mph in fifth gear with half pedal throttle. Seamless shifts from sixth to fifth and back again thru the mountains. Never did require fourth pulling 12,000 lbs. Avg. 11.9 mpg for round trip. She's so smart. This truck does everything right. Even blinks the signals five times instead of three when a trailer is connected. So quiet even under load! Can't say enough good about it.

 

I've had the same experience with my 6.7. Tows great but I recommend air bags. My 5th wheel is 12k dry loaded its up to 18. I dont know about your truck but my 250 sags a lot.

 

My pin weight is about 2300 lbs. and the 350 runs almost flat. The space between the top of the tire and wheel well lip is almost identical front and rear with the trailer weight on. Our '05 250 had Firestone Riderites on it in order to run "flat". It took about 30 lbs. to even her out. The 350 levels out just right for my taste. We did not have the bike on this trip, so with the bike adding weight to the rear it may not squat as much. So far so good though.