How much will the Passat/dolly weigh? How much will the tongue weight of the Passat/dolly be? What are MB's maximum recommended weights in this regard? Bear in mind that MB's recommendations presume that the entire car is in excellent condition. What kind of hills/mountains will you be climbing? How healthy is the transmission? How fresh is the trans fluid? Are your brakes in good shape?

Let's face it, asking any 15-year-old car to tow a 3,000+ lb. sedan almost halfway across the U.S. is akin to requesting that your grandmother move your barbell set from the basement to the attic. Pretend that it's be kind to w124's week, and beg, borrow or steal a 3/4 ton or better pickup for the job.