One of the reasons I bought my wagon was to tow it. So can it be towed? Here is the info I used to make that decision.
Remco towing info
Even Subaru said this
And some brackets to use. I plan to make some like these
http://www.roadmaster-tow-bars.com/mounting-brackets/roadmaster-classic-tow-bar-mounting-bracket-906-1
And mounting instructions
instructions