To the OP. Your load range C tires have a combined capacity of 7280 lbs. Load range D tires would have 8600 lbs combined capacity. That's a significant increase without having to go to a larger tire.
I just upgraded from LR C tires to the Carlisle HD in 205/75-15 LR D. It only took one trip with the trailer to feel the difference. Much more stable and the trailer seems to roll easier. Also much less sidewall flex.
My concern with going to a LR E tire is it would be too hard and create more stress and shock to the axles and springs. Maybe, maybe not but I think a D tire is the right choice.
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2016 Jay Flight 24RBS
2016 Ram 2500 CC 4x4 6.4l HEMI
Sold :( 2006 Ram 3500 SRW, QC, 4x4, Inline 6.
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