So I made the switch from a 5.7 HEMI to the eco diesel. According to my vin lookup my max tow is 8100 and max payload is 1405. I have the 3.21 axel and the bigger gas tank. Does anyone know if that payload includes driver/passenger weight? The trailer I was looking at was a 27 foot ultra lite with a hitch weight of 550. Does that sound like something this truck can tow?? The dry weight of the trailer is 5,400 lbs.
The tongue weight of 550 lbs goes against your truck payload, so 1405-550=855 lbs remaining for passengers and cargo, in the cab and/or in the bed.
The fuel tank (full) is already considered part of your truck’s payload capacity.
You will require a weight distribution hitch, or you will get a fair amount of sag, specially if you have cargo in the bed, a proper set up, level truck and trailer looks so much better and most importantly it distributes the weight evenly (some weight is transferred to the front wheels) for better handling.
I have towed my flat bed trailer loaded with shingles over 6000 lbs on the highway, I was actually quite impressed, it seemed effortless, I also towed my 8X16 enclosed trailer (2300 lbs empty, 5000 lbs loaded) for many miles, it is definitely harder to pull on the highway, empty or loaded, because of the wind drag compared to the flatbed trailer, the faster you go the more drag you feel and the mpg will drop drastically, head wind is a killer, I stay near the speed limit 50 to 55 mph (80 to 90 km/h) Northern Ontario and 60 mph (100 km/h divided hwy)
Southern Ontario Canada. I achieved 15 to 16 mpg (18 to 19 mpg Canadian) in 3000 miles total. All scenarios applied to the total mpg, the trailer was loaded half the trip, some days fighting the head wind.
You have the 3.21 axle ratio so you will not see 8th gear unless you go downhill, and you go faster than 60 mph, don’t worry, your 7th gear is equivalent to my 8th, so same rpm. You will also be feel a bit more resistance taking off from a stop.