Well, thanks guys for helping me spend money! I've been wondering about this for my 2015 2500HD Denali. I am not towing that frequently right now, but the 330SS does make the truck squat a bit and anything to help make it more stable is always welcome.

Oops. Doubled up on the posts...

FYI ALL ford factory hitches flex with any tongue weight. All my fords I drop the hitch and put two stiffeners in to eliminate torsion flex. Its amazing how it changes the handling and comfort of the haul. I would imagine that GM has the same issues. Jump up and down on your loaded hitch. If you see any movement it WILL transfer to the truck. My new then 2012 on a trip to FLA I stopped in Tex and ripped the hitch down and took it to the local weld shop.. I was drivin me nuts. Whew all better after the stiffeners.....

fossil fuel, can you provide more detail on the "stiffeners" added to your hitch? Maybe even pictures?

I pulled the factory hitch from under my 2005 F-250 and added a class 5 Curt..........175 bucks free shipping from Amazon

I have a Putnam Class-V under my Ford F-350. (No longer in business, but a few NOS hitches still exist online).
I have a Curt Class-V under my Chevy 2500HD.

Use www.etrailer.com to help you find the right hitch for your application. Then you can use the part number to comparative shop on eBay and Amazon. I like etrailer.com a lot and just bought some stuff from them last week in setting up my GF's ML-Class Benz to tow her camper.

I had a Putnam on my Avalanche 2500 and boy did it help, along with air bags the ride smoothed out.

I've had ford chevy and dodge trucks over the years and none of there hitches are any good
way safer to just get a real hitch installed day one

now the hitch on the sport chassis is a different story that thing isn't going any where

I just replaced the factory hitch on my 2500HD with the Curt 18,000lb commercial duty in reaction to a recent thread on here. I can't say I notice a difference but I sure feel safer!

That's a great comparison pic! Thanks.