I ran Dynatrac LRH PR16 245's on my F250 and found they worked just fine in snow, mud and wet conditions. You can get even better performance if you get the tires siped, but they say it will wear the tread quicker (probably not an issue with 19.5's). It was only where you needed a larger tire surface for flotation where they failed because they were so stiff. I tried running them at 50 PSI in the sand and they didn't flatten a bit - I was scared to go any lower and lose a bead. Unloaded I ran them at 70 PSI on the road and 100 PSI when under load. My 5500 uses the smaller 225 OEM Continentals in a LRG PR14 rating and they behave the same as my previous 19.5" SRW setup. My F250 ran traction/drive tread on all four corners and was a little loud with the open shoulders up front. This time I have street/steer tread up front and only the open shoulder tread in the rear and it reduced the tire noise that enters the cab.