33x12.5x16.5
 

All I can find is the BFGoodrich Tires All-Terrain T/A KO. Anyone know of any others, and where I can buy them?

they are going on my future 'daily' meaning 5-8 miles per day m-f...

Got rid of mine for just that reason. Almost no one make Tires in that size anymore and the few that do r pricey.

unfortunately, the 16.5 inch tire is getting harder and harder to find as the soccer mom club keep asking for the "cooler looking" large tires in the 20+ inch class.
i am looking at nothing under 18 inch tires being available for new purchase within the next 10 years.

I think you are stuck with BFG's and some of the Interco tires (Super Swampers). I was having the same problem you are having when I had my F250. If you are going to keep the truck through a couple more tire changes, it would probably make sense fiscally to just go with a wheel size change. Because of what Tom says you should probably go with an 18" wheel just to be future proof.

New BFGs are ~200/ea. I bought a set of 4 almost new used tires with aluminum rims for $500.