The only hitch option for your 2009 Audi A8 is the light-duty Class I hitch # C11199, which is indeed rated for a low 150-lbs of tongue weight (TW).
Hitch makers design their hitches based on the weight capacity of the host vehicle's frame; if a car can handle only 150-lbs of TW then there is no way to bolt-on more capacity by installing a higher-rated hitch. It is the old rule of the weakest link in the chain; even if there were a 300-lb-rated hitch for your car it would not help since... view full answer...
I get where you're coming from, but the only time manufacturers mention the weight rating being reduced is when an extender is used, because then you're extending the accessory that much further out from your hitch receiver/vehicle. In the case of the Ultra-Fab Dirt Bike Carrier for 2" Hitches # UF48-979033, you don't need to double the weight (or reduce the weight rating of your hitch) since Ultra-Fab has already done the testing and rating for this carrier.
Hope this helps explain it... view full answer...
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