Whether the underlying facts are a fraud is beyond anything anyone here can tell you. Whether Sixt would pursue a case is also something that is beyond anything anyone here can tell you.
This is not a question of reciprocity but the simple fact that Sixt may enforce a judgment it obtains in a German court against you in, by way of example, an Alaska state court, because Alaska law expressly permits it. This would not be a question of Sixt suing you in Alaska, but rather Sixt obtaining a default against you in Germany and then filing it in Alaska and proceeding from there.
EUR 2000 + interest + attorneys fees can add up to a large sum of money. Either fight this thing on the merits, reach an agreement with the Frankfurt firm or spend some money on a lawyer in Anchorage to advise as to what may happen if the judgment hits you in Alaska.
Last edited by Often1; Jan 8, 2019 at 6:35 pm