Your GVWR for that trailer is 12500lbs. Being a fifth wheel 15 to 25% of the weight will be carried by the tow vehicle. So the most your axles should ever carry is 10625lbs if you never overload it. You have a pretty good safety margin there. Most trailers have axles that are underrated for their GVWR but more than enough when you account for the tongue weight or pin weight.
Cheers
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2014 Jayco Swift 281BHS, 300W Solar!
2015 F250 XLT 4x4 Crew Cab, Short box, 6.2 gas
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