I know a 285 will fit without a lift, I've seen one with this size on.
Most shops wont commit to tire size, each truck fits oversize tires differently depending on spring age, weight carried, and a long list of other things. Some shops wont even install larger than factory size tires these days theres to many liability issues.
4Wheel Parts Wholesale has pretty good knowledge on tire fitment, try their website. I dont endorse them for tire purchases though. Look elsewhere, something local that carries lots of truck tires in stock so you dont get nailed with shipping/freight charges.
Most shops wont commit to tire size, each truck fits oversize tires differently depending on spring age, weight carried, and a long list of other things. Some shops wont even install larger than factory size tires these days theres to many liability issues.
4Wheel Parts Wholesale has pretty good knowledge on tire fitment, try their website. I dont endorse them for tire purchases though. Look elsewhere, something local that carries lots of truck tires in stock so you dont get nailed with shipping/freight charges.