I have steel cased tires on my truck and am shopping too. 235/85/16. Costco is really hard to beat, I plan on buying Michelin XPS Rib from them.
Firestone has the Bridgestone Duravis R250 tires for $990 installed. The Duravis and the Rib are stock size Commercial grade tires. The Goal is maximum durability cooler running, long tread life, and sidewall protection.
The Ribs are 1080 installed at Costco.
I believe Costco has the best deals however they don't carry every brand. The Install is 15 bucks ea that incl road Hazard Warranty, Rotation and Balancing as long as you own them and Nitrogen Inflation. These priced beat Discount tires and Tire Rack

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1999 F250 Regular Cab 7.3L PSD 2WD.
If it has spark plugs or less than 8 lugs, it is not a truck.