Originally Posted by thoer
Soultrek - LOL - I knew I was living dangerously posting any tire opinion here. In my opinion
- and ( I don't pretend to have an advanced degree in tire engineering) the D rated tires provide an extra safety margin in weight capacity. I've personally noticed no harsher ride, nor loss of traction at higher psi - but then again, I think I'll just stop there......
Yes, tire discussions certainly bring out a range of positions and opinions, coming from a broad range of different perspectives.
Do you run those Load Range D tires at a higher pressure than 50 psi? If not, you have no more load margin than with Load Range C, since they get their load capacity from the ability to handle more air pressure.
If you do pump then up, and haven't noticed a difference in behaviour, try pumping your car tires up to their maximum (if the correct inflation pressure is well below maximum), and see how it rides - a good demonstration of tire inflation effects, and easier to appreciate using the tires more directly connected to the driver. In amateur motorsports competition we paid significant attention to tire air pressure, but of course the average driver on the street wouldn't go as far. Even on the street, forums dedicated to specific models of car routinely contain discussions of optimal tire pressure, because ordinary drivers notice the effect... but with the tires on the trailer instead of the tug, differences are much less noticeable. Given the many threads discussing rough ride effects on the trailer interior - including refrigerator doors that need straps to stay closed - it seems to me that ride harshness in the trailer matters, but I suppose that's a matter of personal opinion.
Trailer tire traction is only noticeable in those times that life on the road gets really hairy. What is not noticeable in normal driving may matter in an emergency.