I'd look for a more knowledgeable inspector. Sloppy steering = something worn or out of adjustment and a pro ought to be able to find it. If you are in the northwest, go to Henderson's Line Up in Grants Pass.
On the old Oshkosh, I would suspect the Bell crank. I've heard they had the same sloppy bell crank as the old Chevy chassis. Henderson's is the source of ar replacement there too - the Supersteer Bell crank.
2004 American Tradition; 2013 Buick Verano
Homebase in the Ocala Nat'l Forest near Ocala, FL