I run an 850 and wanted more height. The dealer talked me into tall tires and the four foot extension. It helped some. But I decided if they could extend the horizional auger why couldn't I extend the vertical auger. I got a 14" extension made up to fit between the turret and the vertical auger and gained 18 or so inches of more clearence and when the auger is swung in it is no higher than the cab or grain tank extension.