What self propeled sprayer should I get a 4940 or one of the first R series.

If priced close to the same, R series all the way. Quieter cab, better ride, better roading visibility, boom visibility about the same. Load command or whatever they call the pad by the fill port on the side is nice, but the ones without it are pretty simple to figure out with the diagrams on the side of the sprayer. Biggest downside to the R series is the hinge pins on the boom at the first fold ...