I think the only thing is a full size spare. Heavy duty cooling, transmission cooler, 180 amp alternator come with other options.
There is some sort of a wiring harness under the dash for a trailer brake I think?
I was hoping the drive train and suspension would have more heavy duty parts but I am not aware of any.
Maybe the rear coil springs are stiffer to support the weight on the trailer hitch?
Was hoping the C clutch snap ring in the 9 speed transmission was stronger?
I have the same question about the 2014 TH's?
I have asked my dealer about this and it seems to be a great mystery.
Hopefully you will get some illuminating replies.
My theory was if the TH can tow 4500 pounds then it can get me up my hill in 4WD low when it is not towing anything with ease and won't over heat.
Last edited by sanghill; 09-08-2016 at 05:41 PM.
Reason: add info