Towing ANYTHING, having proper chassis to handle trailer behind it weight wise. ALSO one needs the proper drivetrain for how you use the rig too! Are you literally under 50-55mph local roads? Steeper grades, IE greater than say 15%! Are you on an interstate wanting to hold 60mph on a 2-3% freeway grade?
Their is not a single truck made in an LDT form currently, that you can order to suit your needs. It's down to a one size fits all. That size, no matter the chassis, may not fit your usage!
I have no problem admitting, current tow rating gcwr specs suck in how I use my trucks pulling hauling etc. Geared way check too tall!
Marty