Snow plowing is harder on a truck than towing. I had a 1983 F250 HD 4X4 with the factory snow plow kit many years ago. You're going to find the salt on the pavement gets into everything. You will find it's very easy to bend or crack the frame, even on a heavy duty chasis. As for the front end, consider doing a rebuild after every winter to include shocks, A-Arms, and steering linkage. Weird tire wear patterns on the front end are normal for snow plow trucks. My son plowed to make money for college with that truck and made good money, but the hours are long and it's hard on equipment. He used the Sno Hydro Super 650, no longer made, but built like a tank from the hydraulic reservoir to the blade. It added about 800 pounds to the front end.
This site has everything you want to know about plowing and how different rigs rate.
http://www.plowsite.com/forumdisplay.php?f=7