Not sure how it is on your side of the pool but here in Down Under 285"s are a very common size and
very easy to get.
That's what I thought re. 285s on 6.5J.
33" are fairly common in the UK, and popular with the Land Rover folks. In fact I believe the MoD is using 285/75R16 on their Defenders.
But I just fancy my rims too much to go all the way to 33". 32" will already be an improvement on the look department.