2013 Subaru Crosstrek battery dies when towed

On my Saturn, it is the 30amp under the hood Ignition fuse

How are you towing the Subaru 4 down or on a dolly? Are you towing it with the key in the off, acc, or on position. Are you using a braking system that requires battery power?

DO you remember what the fuse in that Saturn was for?.......pull the same for the Subaru.

OR..........when you stop for rest break/potty break turn Subaru on for 5 mins to check battery charged.

Battery life goes down hill fast everytime you drain voltage down below 12V

I added a battery switch on my F150 Truck one time when setting for a long period of time...

This reset my on-board computer stuff which would not learn the old settings when I engaged the battery connection again. Mmy truck would die at the stop sign stops unless I would hold down the gas pedal...

I eventually had to take it back to Ford and put on their computer machine to reset the settings which cost me $90 for a 5-minute reset time.

Don't know if this might be an issue for you or not...

Roy Ken

Perhaps, I would add a simple battery shutoff switch, under the hood.
( it's a great anti theft device also)