You can get 24D that is supposed to be easier on equipment. I've purchased it by the gallon to use around the barnyard in my pull behind sprayer (not crop sprayer). It is milky white. I don't think it works as well.
They will all say they are non corrosive or safe, but there's a reason sprayers rust at the joints and pins freeze up. That stuff is hard on things. If it were me I would use something with more of a residual so you are constantly doing it. Roundup is contact only. Watch your runoff.