I'm the OP. Yesterday I had the Hankook F19 7.50R16LT Load Range G (14 ply rating) Commercial Light Truck tires installed. There was a question on our rig whether there would be enough clearance, but while close--no problem. The dia of the stock LTX MS/2 is 29.2" vs the F19 is 33.2". The rig looks better with the slightly bigger tires.
With the LTX my speedo read 62mph when my GPS said 60. With the F19 my speedo reads 60 when my GPS says 64mph, and at 40mph both the speedo & GPS agree.
With just the 65 mile drive back from the tire store---the new tires were smoother and just as quiet. The rears have 85psi (2540 lbs/dual tire) and the fronts have 70psi. In 2 weeks we'll be loading the rig up for a 2 week vacation to the OR Coast--so I'll weigh on the way there. I was planning to get a rear track bar installed along with Koni FSD shocks--but I'm not sure I'll need them with these tires. We have lots of tire grooves in our roads caused mostly by 18 wheelers, and these tires seem to track better than the LTX's---with my limited driving. Wind & 18 wheelers passing have not been observed.
The only thing that needs to be fixed is the spare tire carrier. It has a plate to keep the tire from moving forward, held in place by by a 1" sq tube. That tube needs to be increased by 2" for the tire to fit, so I need to take the bolt-on carrier down and have the tube length increased.
I took a bath on the trade-in of the original tires--given the spare had never been used and the other 6 only had 4400 miles. If anyone is interested--Walmart sells these:
Hankook F19 Tire - Walmart.com
just check your clearances for the increased radius of 2". Width is not an issue--my duals now have more space between them than the stock tires did, perhaps because at 80psi, they still had quite a bulge close to the ground.
I still have a very minor concern regarding the max psi spec of the stock wheel. Ford will not provide me with a max psi spec and it's not stamped on the wheel, but I assume it is 80psi max. Everyone I have talked to--parts guy at Ford, service manager at Ford, Coach-Net tech, my tire guy said--at 85-90psi, cold psi I'll be ok. They have never heard of a wheel going bad because of 10% or so overinflation.
Thanks to all who have posted their opinions of this tire,