MOR/ryde Pin Box

2014 4100 Heartland Cyclone...GVWR = 18,000 Current Pin Box is a Lippert 1621

Should I go with MOR/ryde P/N #RPB72-1621HD-05 (14,001 to 18,000 GVWR) or -06 (18,001 & over GVWR)? What say the wiser? Price is about the same.
 
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