The fixed front wheels on the ZTS take care of that issue and that's why they have a 20 degree slope rating. This one has a Kawaski engine, but still no ROPS. Ultima Series™ ZT - Zero-Turn Mowers | Cub Cadet US
Thanks for that nugget. I had seen the slope ratings on the Cub Cadets but wasn't sure if that was for side-hilling or not (the image they use shows it mowing up the slope, not across the slope)