Limit travel, hold up the bar in the event of catastrophic failure, sanctioning rules, piece of mind Or ........?
BTW the small (economy) jack-stands (pictured under the rear) especially at max lift have "surprisingly" little stability. I found out the hard after tipping a car into a garage wall as it fell over - so I'm gun-shy whenever I see them . At least IF you use one a 3-5 Ton stand on the other side the axle (which you might already have there) it adds some stability to the small stand. Small footprint stands are a nightmare waiting to happen. I ended up welding large steel plates under my small footprint stands and pouncing on 3-5 ton stands that are majorly stable whenever I found them priced right