Where in Stratford are you thinking? Shakespeare has a few spots too but there is some scratching to get out of town. 

A busy snowmobile weekend, and he runs out of premium.

The Esso is the perfect place to fill up. Couldn't be any closer to the trail.

Atwood has a municipal parking lot.  Usually put a sign up for no parking if there is a rental at the community center for No Parking.  But you don't know that till the day you get there.  The gas station across the road has room for a few trucks and trailers, and usually doesn't mind  (be polite fill up when you get back there).  Right on the trail.

My search for prime parking is continuous year round . Recent finds have been in Listowel  , Clifford and Stratford .  Scratched Teviotdale the restaurant sucks .