I believe that most of the warnings about using a WDH with a unibody are meant for traditional (smaller) unibody SUVs from the earliest crossover (CUV) days when they took a lighter weight steel riveted and bolted frame from a car and just put an SUV on it for better fuel efficiency. Modern unibody SUV frames on nearly every midsized 7-8 passenger SUV, are built differently with stronger steel or aluminum so it is conceivable that they can tow more than an older or smaller vehicle. But because the frame rails don’t extend the length of the vehicle like a truck, they would have to distribute weight differently. This is all the more reason why Kia should include guidance. That said if you see a WDH lift the weight off the back axle it has to go somewhere, it either goes to the front axle or back to the trailer which are the only other points in the setup touching the ground. Exceeding the gross axle weight rating on the rear is a lot more likely before you hit max vehicle weight rating with passengers and cargo since the front axle has the engine and you don’t carry cargo on the hood. Breaking the rear axle at low speed would still probably be a safer disaster than driving down the road and having the trailer fishtail and flipping the towing vehicle. Too much weight on the rear axel means that the front tires have less grip on the road and the hitch will act as a fulcrum lifting the trailer tires up. That's why you need to distribute the weight off the rear axel which also happens to be where you put most of your passengers and cargo in the Telluride. Sure the WDH weighs some, but the overall benefit outweighs (no pun intended) the addition to total vehicle weight.
I think for a number of years the Dodge Durango held the title as the most towing capacity for the midsized class and it was body on frame truck based SUV. For a few years it switched to unibody to share with the Jeep Cherokee and for 2022 the Durango is going back to body on frame. I wonder if this is because the concerns of a purpose built SUV unibody frame with towing capacity still aren’t clear. But there are still plenty of other midsized SUVs on a unibody frame that compete with the Telluride that offer 5,000lbs of towing. Subaru Ascent, VW Atlas, Toyota Highlander, Infiniti QX60, Volvo XC90, Chevy Traverse, for example all have towing of up to 5,000 and all on unibody frames. The Ford Explorer is unibody and it goes up to 5,600 and the Jeep Cherokee's unibody can go to 7,200. The newly announced 2022 Nissan Pathfinder switched from a body on frame back to a unibody and it has a reported max towing of 6,000 lbs. Another example is the Land Rover LR3/LR4/Discovery, that midsized SUV uses an all aluminum unibody frame and it is supposedly rated up to 8,200lbs. The point is that most manuals don't explain how to get up to 5,000lbs towing on a unibody frame and when you go to a travel trailer dealer they discourage towing on a unibody because that's what was thought for the early days of smaller SUVs. The 1984 Jeep Cherokee was one of the first unibody SUVs (if not the first) and it has a max towing capacity of 2,500lbs. But the vehicles are bigger and stronger than they were 30+ years ago.
With the Telluride I'm more confused about the Electronic Stability Control or Vehicle Stability Management. I'd like to know if you do get a WDH should you get one with or without sway control if the vehicle already comes with anti-roll and anti-sway safety features.
I do agree. I wish Kia would publish something better to explain the towing capacity and best practices. Nissan offers a
website and a downloadable PDF towing guide. To date, this is the best guidance I have read:
"
Any time you are towing a trailer that has a gross weight, when fully loaded and ready to travel, that is over 50 percent of the vehicle's gross weight, a weight distribution system and trailer brakes are recommended. If your vehicle weighs less than 6,000 lbs, a weight distribution system and trailer brakes should be used when towing a 3,000 lb trailer." (
reference) Here's another reference article related to the discussion:
https://www.etrailer.com/question-241876.html