Do I need D tires?

waynefi wrote:
Would I gain much by using load range D tires on a 4500 lb GVWR dual axle trailer?

My current load range C tires (Karrier Loadstar 205/75 R 14) have held up well. They have a 1760 lb load rating, which seems like plenty of safety margin.

What exactly is load range D anyway? I know it will allow 65 psi inflation, but what is the load limit?

You would gain nothing by going from C to D range because your trailers GVWR is only 4500lbs. Stick with the C rated tires heck I have the 205/75/14s Load C's on my 7200lb GVWR trailer and have never had an issues after 40k miles. Even with the so called china bombs that were on there originally. I now have the Carlisle Radial HDs and like them alot. They also give the higher speed rating of 81 MPH. My original Trailer Kings were rated for 65. I like having the higher speed rating for piece of mind even though I never tow above 65 anyway. Stick with the Load C and you will be fine. Most people have issues with their trailer tires from lack of proper maintenance and inflation of the tires. I always make sure mine are cold inflated to the 50 psi before rolling down the road.