v-8 SUV's are infamous at having great towing capacities, but lousy payload amounts. plus they have soft suspensions.
most will run out of payload, WAAYY before they ever come close to their max towing capacity.
so, everyone other than a 150lb. driver, cargo and the WDH, all have to come out of the payload amount.
and since SUV's usually have lots of passengers, their weights end up eating up much of the payload amount.
and the Burb's GVWR is really not that important, as much as its payload amount and the GCWR numbers are.
the Burb's GVWR is just the max it can weigh by itself.
so, yes, you need to post more info on it, like year, rear end ratio, factory tow package or not, 4x4 or 4x2, weights of passengers.