I own a B Kubota tractor and an RC30. The RC30 is only rated to go on a 10 degree slope not 20 degree like the sr-70. However I do feel safer in the RC30 and suspect if it did roll it and would be in better shape than if I rolled my tractor. The problem with the rc30 is the undercarriage doesn't like to have gravel and dirt left in it. The rollers get worn and are expensive to fix.