Towing a 5th wheel with a 1/2 ton truck

So let's hear from the guy who towed a 10k fiver for 3 years and 12000 miles. Me! I had a 2011 F150 Super Crew Max Tow (3.5L Ecoboost, 3.73 rear). I added Supersprings and Bilstein shocks as the HD Payload was not available. I was at the GC limit and 500 lbs over the rear GAWR. It pulled, handled and stopped well, including mountains of VT, NH, CO and WY. My only complaint was not being able to carry anything in the bed and being careful not to put anything heavy in the basement. The fifth wheel safe towing Web site says the properly configured F150 is the only half-ton capable of towing a fiver. Obviously sane numbers are important.
I have replaced it with an F350 for more pulling power, bed room and weight capacity. Handling seems similar.