I had similar issue, but just changed my front tires from 11R22.5 to 315/80R22.5, and the 315's are load range L. I run them on the thinner 8.25 inch wide wheels. This gave me some margin for weight. I did not change the axle or hubs.
As stated, it is very difficult to get a straight answer if the axle and hubs are actually any different. I am sure when you jump up to a 16-18K axle there are some differences.
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2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
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