I suspect your fellow Michiganite (?) is correct in that flat towing won't be an issue. However, you may want to consider removing the driveshaft if you're going to flat-tow it that distance. There is some debate about whether the transmission can be damaged by towing a B with the driveshaft engaged (i.e., the transmission gears turn but get no lubrication which requires engine power) - there are stories on both sides of the coin. Better safe than sorry, I say....
I also own an Audi and there has been a thread about towing on an Audi e-mail list I subscribe to. The issues is that most US Audi's are limited to 2000 lbs in the US, while the same car and equipment in Europe is rated at 4000 lbs! General consensus is that this has more to do with the litigious nature of US society than with any environmental differences between Europe and the US. S, I suspect that your car is capable of hauling more than 1500 lbs. A trailer hitch shop should be able to give you a better idea.
Dan D
Central NJ USA
'76 MGB Tourer Driver
'65 MGB Tourer Project
NAMGBR #5-2328
http://dans65b.blogspot.com/
http://mywebpages.comcast.net/dibiase/Working_MG_Gallery.html