Center of gravity seems to be mystery for 99% of TC owners.
While rear seat passenger weight will go over 50% onto front axle, with longer camper close to 100% of the weight will go on rear axle.
You can load 4000lb of firewood and putting most of it behind the cabin you will be ok, but 2900lb of camper going on rear axle might overload the tires.
Center of gravity control on camper is very limited. You can move spare tire to front bumper, what will give you biggest gain, but shifting weight or moving camper battery on front of the camper will give only small differences.
You can guess endlessly, but sooner or later you will have to go to scales.