Once you put 5K lbs in the bed of the F450 pickup, it rides just fine. Air suspension and air seats would not be needed by the vast majority of people. Hauling a TC on a cab and chassis F450? You might need air suspension depending on the GVWR of the truck and your tolerance for pain, but in my opinion if you can load a truck up to 90-100% of its weight rating, you’ll be a lot more comfortable than in a truck loaded to less than 75% of its payload rating.
But, to get back to the topic, I’d love to see the 7.3L offered as an option for the F450 pickup. I think it’s got plenty of grunt for hauling the biggest TC’s, and judging by the towing specs for the current Superduty and cab&chassis trucks that you can already get the 7.3L in, I’d expect the maximum trailer towing weight to be about 19-20K depending on the configuration of the truck and whether you’re talking conventional or fifth-wheel/GN towing.
For the 2021 model year, I notice you can get a regular cab and 4x2 in the F450 pickup now. And, it looks like 19.5” tires, wide track front axle, and bigger brakes are all standard for the F450, and not available on the F350. I could swear there were a few years around 2017 that you could also get 17”, 18”, or 20” tires on the F450 pickup. Whatever.....the speed rating on the Continental tires on my truck is around 85 mph. The ECM limits the truck max speed to that, and I’ve yet to need any higher. Personally, I’d rather have the 19.5’s.
Edit: tiresize.com and other tire websites show that the 2011-2014 F450 pickups all came with 17” (245/75R17) tires. No 19.5’s on those years at all. All other model years have 19.5’s, with no other sizes optional. This (IMHO) is further proof that the 2011-2014 F450 pickups were nothing more than rebadged F350’s.
:):)