Anytime you raise the center of gravity, you put more stress on the suspension components in turns, expecially sharp backing turns. Internet has many mentions of factory spring mounts failing--most towables are built to minimum specs needed, with little margin for increase in stress, that is why I suggest if adding height, you reinforce/rebuild the spring hangers.
Also, if the GVWR of the trailer at 13000, you could have as much as 2600lbs of pin weight. With a 100 gals of fuel in the tank, the trailer loaded for camping, you will probably be over the RAWR and over the rear tire capacity--tho, with a lift, the tires MAY have more carrying capacity than normal. Check it all out--towing with a lifted truck can be hazardous to your health and that of others....
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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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