I don't know coonman. I've seen lots of people put plows on trucks that aren't rated for it, and the steering system is still rated for the full max GAWR which depending on configuration may support a small plow.

I wouldn't put a plow on a half-ton truck, but if you want to I wouldn't let the steering stop you. What does the steering gear care whether you have a plow or not as long as you stay under your front GAWR?