Newell recommends that nothing less than H rated tires be used on the front of a Model 2000 coach (1990 up). As an alternative, 305/75r24.5 add extra load carrying capacity but officially you wheels will still limit you to 14,400. Fortunately, Alcoa's rarely fail but overloaded tires routinely fail. I have used the 305/75r24.5 with great success but they are hard to find and VERY pricey. They are too wide to be used anywhere other than the front and tag axles.
I am envious of the low weights you are getting. With my water tank 35% full, my wastewater tank 50% full, my fuel 72% full and my propane ~70% full and the part time 'stuff' I carry, I run about 14,000 pounds on the front and 44,090 total weight.
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