I have used the Discount Tire stores in Longview, Katy, and San Antonio for a number of years. The stores all have given excellent service with the exception of the store at I-10 and Mason Rd in Katy. The other Disco store in Katy is totally opposite. Great Service. As for the tires... ... I am have been running the same tire for almost 50K now, and not a problem one except for the once-in-a-blue-moon mesquite thorn. The 285/75s on my truck are a load range D also, but the load rating is equivelant to a load range E in a 285/35 tire, due to the increased tire width. I'm sorry to hear that Disco is not offering the Pathfinder ATR's for our trucks anymore. I will be needing another set in another 10K.
In general, you get what you pay for in terms of tires and service. The price at Disco usually beats most, but you have to live with the crowds, waits, and occational rude salesman. If you want the best tire, stick to Michelin, but be prepared to pay the premium price. We run ~30 1 ton pick-ups loaded at ~11K up and down Mines Road outside of Laredo everyday. They are the only tire that holds up.