Hey guys I haven't been on here in a while which isn't a bad thing since that means I've been having good luck with the old 318. I have tough snow that comes off the garage and house roofs that the 318 has a hard time picking up. There isn't any down pressure with the snowblower to push down and cut through the packed snow. My question is if I upgraded to a 420 would that tractor apply down pressure to cut through hard pack snow that comes off a roof ? I see a nice one for sale with a 2 stage snowblower, but if the 420 doesn't push down I don't know if I'd be getting a tractor to do what I want. Also are there any common problems with the 420 to look out for ? Thanx for any advice on this.