Since I am new to this forum and a new owner of a 2013 300c I'm sure there has been posts and questions about this but thought I'd get others opinions. We recently took our new hauler out for a few days and of course had a list of items that needed repaired. After picking the unit back up from the dealership I brought it home to clean it up, thought I should check the tire pressure since it was home. As I was looking for the recommended tire pressure I noticed the tires Heartland put on my camper were 6 ply tires rated at 3080 lbs at 80 psi. Now I'm not the smartest guy in the world but quickly doing the math realized that based on that the load rating would be 12,320lbs. Knowing my hauler dry weighs almost 12000 lbs needless to say I was concerned. Thinking maybe when my camper was built the guy putting the tires on grabbed from the wrong stack I called my dealer. Dealer didnt have a answer but said they would call Heartland and ask the question, hour later received a call direct from Heartland. Answer I got was that they have had no problems with the tires "at all", that there is a formula they used to come up with that says they are weight rated correct because not all the weight is on the tires which I understand. During the conversation the person from Heartland admitted he didnt know why they don't install a 10 ply tire and that the costs wouldnt be much more. I then asked the question what happens when I blow one of these 6 ply tires and it tears the side of my new hauler off? Heartland tells me I have to take it up with the tire company! Hear is my question to you folks. My family and I are getting ready to head out on a 2000 mile trip, I am having a hard time with these tires that came on my new hauler, should I go ahead and spend the money and upgrade to the 10 ply tires or run the ones the factory says have not been a issue? Thanks for any input!