just an update ...
6240lbs was perfect with the 749V but as soon as I load it with my family of 6 ... we're at 7100 to 7200lbs; 749V still good.
but with full camping gear for 5 days ... I'm at 7960lbs and 749V isnt enough ... so I ended up adding bags.
ended up using Air Lift Kit #60920; which was perfect because theres a 1" gap from the bump stops ( I cut 2 off ) so it doesnt restrict flex even at only 5psi.
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My Build Thread
My kids call it
ROCKY
2014 Raptor Liner White TEP w/ some mods.