Tires: 2000 Ford F250 XLT Superduty 4X4 tires, michelin ltx m s, goodyear wrangler rt

Question
I bought this truck to tow a 5th wheel 30' 9500 lb. travel trailer. I need new tires. Should I buy what is recommended by Ford (speed, load, rating), or look for somthing that will enhance (safety & fuel economy) while towing? Is there such a tire? I visited Consumer Reports and they only cover "light duty" trucks and I consider mine to be more than "light" especialy towing a 30' trailer. The current tires are L2857516D.  

Answer
your truck is considered light duty until you get into tow truck size like F500-F650's.  265/75/16 is the original OE tire on their, somebody put 285's on there.  Load range E there's plenty of choices out there.  Michelin LTX M+S, Goodyear Wrangler RT/S.  Keep in mind these tires aren't going to last seeing you're towing a trailer.  how often do you tow this?