I think you need the larger wheels with that weight being approx 700 lbs over max. It could also be concerned about axle weight rating.
Just as comparison, my weights are 14,400 front and 20,600 on rears. What is not funny is my front tires are up around 90% of max, and the rears (8 of them) are around 30%. I always load heavy stuff in the rear to help front axle weight.
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2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
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