I've towed more than most people on here 3 times a week 25 miles a day for 5 years with my old trusty 1990 Suburban hauling a cargo trailer loaded to 8500lbs. never had a need for WDH, I do recommend people buy a cheap trailer tonge weight scale if you do long distance traveling Balance is important! . If you keep the rig at 55/60mph your Safe, wagging the dog issues do creep up when the hitch is very light causing lifting of the rear end.. just dont hauling ass at 75-85 mph , in windy areas, and wooped out roads , you will get into issues for sure.
K2 1500 trucks have stiffer rear leafs than previous models so stability has improved on these trucks compared to older generations. i would rather put the money into a rear sway bar instead of WDH