Glen-
350# rating turnbuckles might not be enough. I've got some test data run with a CAT1 hitch and a 12" plow that shows occasional spikes well beyond 350#. This is all with the caveat that this was a "brand x" tractor weighted to the hilt and with their own geometry (thouough if you read any of the old '70's era engineering prints from JD, they ALL say Brinly on them).
350# rating turnbuckles might not be enough. I've got some test data run with a CAT1 hitch and a 12" plow that shows occasional spikes well beyond 350#. This is all with the caveat that this was a "brand x" tractor weighted to the hilt and with their own geometry (thouough if you read any of the old '70's era engineering prints from JD, they ALL say Brinly on them).