Bob -
The original thread has gotten kind of confused, so I have moved your topic to its own thread.
My first thought is to upgrade the tire size. Many threads on this forum have discussed why and how. The 14-inch Marathons are right on the edge as far as load-bearing capability is concerned. If you load your TM very lightly, the tires are within rating, but depending on how you load it, it is easy to overload them. A move to the 15-inch Marathons will probably have good results - they have for me - by adding substantial margin to the load-bearing capability. I think that TM has gone entirely to 15-inch tires in response to the overloading question, with good results.
The original 14-inch Marathons are Load Range C, with all that implies. The 15-inch Marathons are load-range D, with all that implies. Load Range E is still heftier, but you have to watch out for the rock-hard tires shaking the daylights out of the TM. IMHO, load range D is fine, but others may legitamtely disagree.
Bill
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