The SMAX is plated on the drivers door pillar at 4120kg for a braked trailer, the car is about 1600kg and the trailer 800kg and if the Lexus is about 1350kg that should be about 3750KG if my maths are good, yes i'm covered to tow a trailer with my licence as I done it for years in my last job pulling cars on a trailer only I used a Shogun or Landcruiser to do it.