It was an ok tire. Only lasted for about 30,000 and that's with rotating and checking the air pressure. Decent off road traction, I did like that they were very quiet, but I never cared for the sidewall. It was too flimsy, which gave for a nice ride, but I never felt very confident of them off road.
Same with the Cooper ST, which if your tire guy knows much of anything will tell you that it's been discontinued for the past two years, the ST MAXX is it's replacement. It was an ok tire, but keep in mind that if you need one replaced down the road, it might be pretty hard to come by.
I prefer the Cooper STTs over the ST MAXX, but that's my preference I guess. They have the great off-road traction when I want it, they aren't very loud on the freeway, and they do well in the snow and ice. I get mine center siped, and with that and good care, I squeezed just over 65k on my last set of those. I don't quite know how, but I hope to get another 50k out of the ones I have now!
As far as a how-big-can-you-go.....yeah 285s are it without rubbing, you can squeeze 305s under there, but then you start rubbing pretty good on the leaf springs.