I have plowed snow with a B with a C rear end for years. With used anti-freeze in the rear tires it will plow some snow on gravel. It depends on how deep and heavy the snow is and what the conditions are under it. On hardpacked snow or ice you will need chains. Heavy wet snow that is deep will require chains. Light dry snow can be plowed most of the time with no chains. How do I know? Well mostly the chains don't get put on until a snow comes that requires them so I have found out. Then they stay on for the rest of the winter. I am in Rhode Island, we don't get too much snow but sometimes there can be a foot or more of heavy wet stuff, or a foot or more of light fluffy stuff and everything in between. These tractors work well I think, the only thing you need to keep in mind is you don't have live hydraulic power, nothing that you cant deal with though.
Good luck , Tom