Yeah, can't change the factory ratings...but what are you trying to gain? Axle capacity or tire capacity? Putting 2 more tires on the rear will add tire capacity (ads in Trailer Life for many years from a company that supplies kits--never seen the reason to spend money on something that really doesn't change ratings)--but not help on axle ratings.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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