Just last May I replaced my GY Marathon ST205R75x14 tires with new 65psi Al. rims and Kumho 857 195R14C load range "D" (106/104R D) tires. I've only used them on three trips ... two of about 200mi each one way and one 1200mi one way and am currently on the road on about a 3K roundtrip so not much time or miles on them, but so far so good. I run between 6800 and 6950 on two 3500lb axles (just weighed yesterday and the two trailer axles weighed 6940). I have used GY Marathons for the last almost 18 years and for over 100K miles towing and have only had one flat and that was discovered via a low tire at a CG the next morning during my pre tow checks so I have had no complaints with them, but because I am always so heavy I wanted a little more cushion and the old GYs combined totaled 7,040 at 50psi and these 4 Kumhos at 65psi total 8,376 ... so that gives me an extra 1,336lbs of reserve capacity.
I'm happy with my decision and the costs were reasonable for the upgrade if you can call this that.
Larry
