If the tires are within their load range, the manufacturer isn't going to upgrade them. They are in competition and in business to make money. It would cost them some of their profit to upgrade when getting close to the limits. Not sure why you want to skip LRD and go all the way to LRE... I'm considering going to LRD from LRC when I replace these tires. It does make sense to not be close to the load limit, but skipping a load range seems like overkill. There are LRD 14" ST tires available, and I believe Maxxis has them, too. I know Carlisle has them.
Jack and Delores, Weatherford, Texas
2016 White Hawk 28DSBH TT, 2014 Ram 4X4 2500 CTD