Mike - Can't tell you how much load is "too much". However the M/SM rears are pretty robust. My experience:
1 - My wide front SM plowed many thousands of acres while fitted with duals (the inner set loaded) and 2 sets of wheel weights. The only axle problem was when the tractor barrel-rolled down a steep hillside (fortunately less the driver) which snapped one axle.
2 - For 20+ years my narrow front SM harvested 500 - 600 acres of sweet corn annually carrying a 2-row mounted picker and pulling a Field Hand dump cart. Rear tires on this tractor were loaded. It is still running on its original axles.
Incidentally both tractors are now enjoying a well-earned retirement. They now pull only hayrides and run in an occasional firemens' parade.
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