An easy fix for the front tire loading is to go with 315/80R22.5 tires. These have the higher load range rating and capacity. Best rated for 9-inch width front wheels, but can be mounted on 8.25 inch width with slightly reduced load rating. The axle rating is a different story, several have had to swap to higher rated axle and components.
BTW, the front axle weight issue is also a problem for the high end class A MHs. Some of those are running even higher load than the truck conversions do.
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2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
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