Class B cabin noise, how much is too much?

Are you getting these noises from the chassis or inside the coach? There are lots of places in a Class B that need some extra quieting down that have to do with the cabinets, appliances, etc. It took us the first year to track down the noises that occurred when we went over a bump or were riding on a rough road that were INSIDE the coach and we still have a few that we can't figure out. These have nothing to do with the mechanics or body of the vehicle. Cabinet doors rattle, anything loose is going to move, shelves in the fridge will rattle, and on and on. Then once you start putting things inside, those will make noise too unless firmly secured down. With close proximity of the driving seats up front and the rear coach you hear everything.