Car models that were once considered by manufacturers as towable, and then not towable in a later model year even though there were no engineering changes, the policy change had to do with frequency of drivetrain warranty claims and associated costs to the manufacturer (this drove Honda to finally say CR-V only, although most model lines shared the same automatic transmission).
At 17 years old and 80,000 km, you no longer need to worry about anything you do towing it making the warranty invalid, all the risk is yours. From a financial viewpoint, that risk is minimal, because of the low market value.