According to the
Bridgestone Tire site's BT-45 page, the BT45 does not appear to be available in the specified LT rear tire size of 160/70-17. Additionally, none of the rear tire sizes show "reinforced" and the closest any come to the 79V rating is 70V. Did not see any front tires in 120/70-17, either.
Of course, I could have missed it even though it was right in front of me (just call me Mr Magoo), it seems that not only is it not rated for the LT, it is not even offered in the correct size for the LT.