The Standard AT4 package consists of a factory 2" lift, Wrangler Duratrac tires and 5.3L engine. The $4,940 Off Road performance package upgrades you to the 6.2L with a Cold Air Intake, and gives you a performance exhaust as well as Goodyear Mud Terrain tires.
Sunglass Holder : Sunglasses Center Console : Wet Wipes, Spare Change, Winter driving gloves, Spare Change and phone Charging Cord. Under Rear Seat : Tie Downs, Detailer Spray and Microfiber Towel Glove Box: Owners manual
One other possibility could be a plugged Cabin Air filter. Have you looked at yours or changed it since purchased? My Wife's Altima was doing just as you describe and a new cabin air filter solved that issue. Instead of a hissing though.... the sounds was more of a flutter or vibration.
Sierra Dan replied to Sierra Dan's topic in 2019 Chevy Silverado & GMC SierraOk, so let me rephrase and take back hate LOL.
They are aiming high because the truck sits higher due to the AT4's 2 " factory lift..... Nature of the beast. Cars will just have to deal with it Will aim even higher if you decide to level the front.
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