Welcome to the 5thwheelforums. That size fiver ought to be about right for your setup, tho the 5.4 isn't known for strength on hills.
Let us know what you end up with.
Joe
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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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