Gluten-free review:
I've been here several times over the past few years and have always had a fantastic experience. The vast majority of their sausages are gluten-free as are their toppings. I'm not sure about their condiments as I don't use them. Make sure you ask them to omit the bun and mention that it's an allergy and not a personal choice. They have told me they grill the buns on the same grill, but I've never had a reaction. Note that I have a moderate intolerance and do not have celiac's disease.
The fries are fried in their own vat so they're always gluten-free. They also have increased their cider selection and now offer a flight of 6 Ontario craft ciders for $14. They also have a soft serve that I have yet to try.
I highly recommend going here for Cider Week, which runs in June every year. They offer three different flights of 6 Ontario craft ciders each, so a total of 18 ciders. The last two years they also roasted pigs and had roasted pig tacos with corn tortillas and gluten-free sauces. It was so delicious. I can't say enough good things about this place.
P.S. They also have vegan sausages and vegetarian fries (not fried in duck fat).
TL;DR most sausages are gluten-free, lots of Ontario ciders