I'm running LT285/75/16 load range E Firestone Winterforce & really like them. Not overly noisy on the hiway & handle real well. only have 20K on them but they still look new. Studable also.
sounds like a fuel knock , you may have to find a dealer & have your ecm reflashed. not good to run it like that for sure. sorry to here of your troubles & good luck.