To replate a trailer downwards to suit the car is one thing but you cannot replate a car upwards to suit a too heavy trailer. What is becoming much more prevalent recently is this scenario...
Toddling down the M5 with wifie, kids and fully laden caravan and pull into services for pee. There stands Vosa with full police back-up and portable weighbridge. Surprise, surprise.

Be assured, you had better not be exceeding the
VOSA rules on loading/towing whether it be caravan, horsebox, boat or whatever or they will
not let you continue until things are put right.
The earlier advice by BTB that 2100kg is the theoretical trailer weight for a hillstart and not the permitted trailer weight is (imho) correct.
Stick with the 4x4.