OP, while I see you have already bought the next set of tires here is a suggestion for next time.
Something to keep in mind if you are constantly running at the 14K weight is that the nylon/kevlar/etc belts don't hold up as well to being constantly at max loads as the ALL steel (tread and sidewall) tires do. The nylon sidewalls squirm more and thus build up heat which is death to a tire. That is why tires spec'ed for motorhome use (where the vehicle is constantly near max load) while still load range E are of ALL steel construction.
I found this out when I was researching tires for my previous motorhome and was wondering why I couldn't use the cheaper nylon ply load range E tires available for pickups instead of the all steel ones that were called for. I talked to tire companies and even a tech editor at Motorhome Magazine on this.