Since we never know what kind of weather conditions we're going to wind up in when traveling in our Class C, I use combination mud and snow tires on our RV all the time. I would NEVER have the smooth, highway tread type tires on our rig.
Also since tire brands are so competitive, I figure that the more expensive tires are probably "better made" .. . or they wouldn't be around long. So far we have only used a couple of different designs of Load Range E Michelin tires on our Class C - they've been quiet, had great traction in a wide variety of situations, and seem to wear forever (with 60K-70K mileage tread wear warranties).