I would go 265/75/16 personally. You might be able to fit a 285 tire but you'll have to max the bars and it might rub.
it is an XL, I thought they didn't have T-bars, only coils...
what size of motor do you have? 2.5, 3.0, 4.0?
What is your gearing?
If I were you, I would find some cheap 15" OE rims, or a set of cheap black steelies. You have a bigger tire selection, and it will be a whole lot cheaper.