If you are referring to a Class 8 HDT like a Peterbuilt, KW, Volvo a lot of haulers have the ET Sr or Comfort Ride.
More at the lower end of Class 6 rather than the full Class 8 Truck. I am getting a lot advise re the air ride type systems and I see the merits in larger tow vehicles but also see that a lot of hitch manufactures are not moving in this direction.
I use ET junior witch has 8000 lb hitch 32000 lb trailer and is air ride and has auto leveling. I think they make one for medium duty trucks too. RVH lifestyles can help you with the right hitch if you need it and installation they are licensed upfitter.
2011 Volvo 780 485 HP/1750 TQ 13 Speed 32000 lb ET air ride hitch
2016 Montana 3820FK Legacy package