I just bought a 4047. I have not taken possession yet but I'm pretty excited. The dealer said there were clearance issues on the back tires for chains so he suggested chains on the front. I was also thinking of grooving the rears. Is anyone running chains on the back of these tractors? Will it be necessary with chains on the front and grooved rears? It is pretty snowy and hilly in my neck of the woods. Thanks.