I just had BFG 285/75/16 tires mounted on my 2001 F-150 SuperCrew on the stock rims. They fit and look great. Didn't know if they would fit but the guys at discount tire have always been willing to 'try' a tire on my vehicles to ensure good fit, no rubbing etc..
They put one on and after we'd tried the steering from lock to lock and eye-balled the clearances, I gave the thumbs up and as a bonus, we found out that this tire JUST fits the spare tire well under the rear. The guys didn't think the spare was going to fit but voila, fits like a glove (any taller however and I'd be driving on the next size down). Don't know if your '99 wheel wells or suspension height is the same as mine, but just take her down to the tire shop and try one on for size.
2001 SuperCrew XLT
Oxford White, Med Graphite Interior
4X4, LS Rear, Tow/Trailer
Skids, Captains Chairs