The maximum braked trailer weight is generally set at what the manufacturer will warrant the car to set off from rest on a 1 in 10 (10%) gradient.
Sometimes manufacturers set the weight limit lower than this (on the 1.6D V70 for example) for reliability reasons (i.e. so you don't need to fry the clutch).
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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