Help, Source for 11R15LT Tyres with a rating 116.

Have had my Turbo Diesel Landcruiser 60 Series Re Spec'ed to carry a heavier load but need to fit tyres on the rear to cater for up to 2500KG (1250 x2) ie 116 Rating.

Have seen an NZ auction site that mentioned Bridgestone 11R15LT in May 2008, but cannot find any recent mention anywhere else regardless of brand.

I go bush with 3 spares (31x10R15LT) and have 3 tyres brand new, and 2 with only 5000km of wear the remaining 2 are near replacement, so do not want to throw all these tyre/wheels out and go to 16 inch Tyres and wheels x 7 if I can avoid it.

Do you know of any tyre company anywhere on the globe that I can get the 11R15LT with a rating of 116?

Thanks

Peter