If i was going to a desert island and could only bring 1 food truck, it would be Food Dudes. Seriously they're amazing. I keep trying new stuff every time i've visited their truck and it's always been delicious. Not only that, but their truck looks damn professional, especially compared to some of the sketchy ones you see on street corners.
They do catering as well which i can't recommend enough. I've been to several events that were catered by them. They carry the food around on these wooden platters that are a piece of art in and of themselves, not even counting the food on it!
At the Metro Toronto Convention Centre they're also one of the preferred food vendors, so when comparing them to the competition there (such as Pizza Pizza), they absolutely blow them out of the water.
Definitely try them out, you won't regret it!