Tommy, you are partially correct, but, If you compare the specs of the brakes, axles, frame to the latest models, and I only researched the Ford line, the specs of the new models are equal to or exceed the 2011 Ford F350. Let alone the new 2018, would really exceed the specs of the older F350.
Here are the specs for the 2018 F150 SCREW.
2018 Ford® F-150 XLT Truck | Model Highlights | Ford.com
3.5L EcoBoost® V6 towing capacity 3.55 rear 13,000 lbs.
3.5L EcoBoost® V6 payload capacity 2620
2,620 lbs.† Requires Heavy Duty Payload Package with 18" wheels __________________