they are a very forgiving drill... as mentioned, keeping that back end in good shape is #1... Square shoulder packers are nice as well, I have 3 bar harrows with edge on shanks, with dutch precision 3.5 paired row openers with a third shoot out the back for the beans, 6.5 inch rubbar and its plumbed for Nh3 which works nice if u get behind in the spring... its got agtron blockage to moniter the double shoot primaries running 2 separate loops, which is a must IMO... I mated it up to a Deere Cart!
I only seed around 4.0-4.5 Mph, but @ 60 Feet... its covering enough acres in a day to keep me more that happy,
-theres enough steel in a concord to build 2 more deep tillers, making them extremely heavy, so don't get too brave around slews and holes, and whatever u do, don't back up!!!