figured i'd give an update...
time came to replace the tires. i probably could have survived the winter without replacing, but i don't feel i'd have the 'bite' in the snow like i've had the past 2 seasons. but, having gotten about 26 months out of this one set of tires makes me really happy.
the rears got down to 14/15/16 (x/32nds) for the outside/center/inside of the tire, and the fronts were 16/17/18.
as you can tell there seems to be a camber issue there. Now for the majority of the miles on these tires (i'll have to look it up later, i think around 20-25k) i did not have the front camber bolts in, so i believe it was the front that was doing the camber wear. when i put in the rancho 9000xls in the front i also put the camber bolts in and got it aligned.
another reason i went ahead and replaced was i started to be able to break the rears loose pretty easily when taking turns. i figure if i'm able to do that, then they'll break lose real easy in the snow.
one thing i did also notice/remember was the 'sloshy' feeling when the bfgs are new. on my worn ones i could take turns pretty fast and didn't feel alot of roll. with the new ones there's this 'slosh' that happens when you start a turn at highway speeds. it's hard to describe but you start your turn, then hold the wheel through the turn and you'll feel the vehicle 'slosh' over just a little like the tires are catching up. it's a little unnerving the first time it happens when you go from being able to take a turn with no slosh, to having that slosh.
lastly, discount tire didn't give me any grief this time when going with the 285's on the stock LE rims. previously discount tire said that the tire required an 8in wide rim, but the stock LE rims are only 7.5in. this time their computer showed 7.5min width for the tire, and 7.5 width for my rim, but was still giving them an error in their system when trying to apply the tire. they just overrode the error, but at least they didn't hassle me about it. paid $285/tire + 16 for mount/balance.