Siberian, are you looking at maximums? here are some numbers you need to consider:
Max trailer weight 7716 (lets just talk braked trailers for arguments sake)
GVWR: this is the MAX your Touareg can weigh including itself, passengers, any cargo, fuel and the tongue weight of the trailer. You can find GVWR in the doorjam sticker, its roughly 6900lbs for most touaregs but will vary on engine/options
Payload: this is GVWR less the weight of your Touareg...a VERY important number and not all that hard to exceed...it is more on V6s and less on V10 (weight of the engine is the factor). A typical touareg average is 1100lbs, so that means if you are towing a trailer with tongue weight of 700lbs, you only have 400lbs of people/cargo/etc carrying capacity!
GCVWR: total weight of touareg and all the crap onboard (inlcude tongue weight) + total weight of trailer and all the crap onboard LESS tongue weight.