WRCRaptor
FRF Addict
I would never down grade from the factory load rating. The difference in truck weight is one reason even if it is only a few hundred pounds, another reason is that the factory engineered the suspension to work with tires that flex pattern based on its load rating. It may not make a big difference C vs D and may not harm anything and going up in load rating to E is most likely no issue as well. I think the difference ride is marginal C vs D so it is just easier to stick to the factory rating.