I don"t go for dropped ball mounts for heavy chit.
They can flex and break...
I would call the manufacture and get his take....JMO
I would be upgrading the whole hitch to a class 5 and a load distribution deal..
__________________
ECM member.
2008 Outlaw Pontiac Drag Series Champion
MANDRA
Do it now fool! Life is short.
69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far..

through mufflers. 1.26 60'.
Going back to track with pump gas engine....
My 60 Ventura retired to street/strip duty..