when the GQ came out, they had several different tow packages you could get,
from light towing - up to 1500kgs
to heavy duty towing - up to 3500kgs
it all depended on the make and model
- TB42 & TD42 could have the 3500kgs
- RD & RB up to 2500kgs
and also the original owner - my GQ had a 2500kg one fitted by the original owner, as they knew they would never be towing anything heavier than a garden trailer with rubbish in it, and didnt want to pay the extra for something they would not use