I might even know said safety rating.
My bobcat for example, lift capacity is 1/2 the tip load.manufacture gives me spec for how where and when the rear wheels lift off the ground. Said load ratings have been spot on.
The tires on it, same size ply rating as one of my past 2500's. But 4500 lbs per tire, instead of 3000....hmmm....look in tire specs, my loader tires are rated for 3000 lbs if driven over 25 mph. Meanwhile, my LT tires are rated at 4500 lbs, if kept at speeds under 25 mph.
Like ALL things great and small, in many cases, one can have multiple ratings for the same item. How it's used or speed can make for multiple ratings.
Marty