I went through the same thing when I was replacing my Carlisle ST tires: I was hauling less than 12,500 lbs. on 3 7,000 lb. rated axles. So why can't I run LT E-rated tires? And I got the same song and dance about rules and regs, and the gubmint says you shouldn't, yada, yada, yada.
I checked my wheels and found that I can run the higher pressure G-rated tires so I bought some, not Goodyear. If I couldn't have run the higher pressure I probably would either have bought G-rated tires and run them at 80-85 psi or just gone ahead and run the E-rated tires and said the heck with it.
I have since weighed each wheel and would have been fine with E-rated LT tires. Of course I would have been breaking the rules. :)
