Another Tire Question

To clarify some of the questions the trailer has gvwr of 7980 max I run it about 7600. Tongue weight is about 1100. Don't really want to change rims as I can't see justifying the expense for what little we are running at this time. The tires on it currently are the originals from when it was purchased in 2006 and have never given any problems, even though they are Chinese made. One of them has developed a slow leak and sidewalls are beginning to crack on all of them. I do store it at my house and typically check pressure every couple of weeks. I always run my tires at max pressure on the trailer.

My original thought was to go to a D rated tire seeing as to how there is really not much of a price differential. Salesman at tire store suggested the 225 E rated which sounded a bit like overkill to me. I think he is going off his own experience with a fifth wheel toy hauler that runs a lot heavier. In this area that is mostly what he sees and most of them run overloaded.

So I guess that really just leaves me to determine if I just go with an exact replacement which is a C rated tire or jump it up to the D rated.

Thanks for all your input it is really very helpful.