Back in April SactoMoFo was a bit chaotic, being the giant success it was. It was our first mobile food festival and so many people didn't know what to expect. I've been to many mobile food events now and here are my best tips for you.
Go as a team! The biggest tip of all. Not a huge team, but one of about 4-5 people. You should all get into different lines and order enough to share with your group. The reason you only want about four people is that some trucks will limit the amount of food you can order at one time. If you had a team of 10 but were only allowed to order enough food for four, that would be hard to share.
Go early. It's all about lines and so I'd much rather be at the front of the line then at the back of a 2 hour line.
Bring utensils and containers. It makes it easier to share, but I also happen to like to order enough so that I can eat things later or the next day. I can only eat so much and if there are 22 vendors, there is no way I could eat it all while there.
Bring chairs. This is not always allowed, but for events that are on concrete with no place to sit, this is a big one.
Bring small bills. Help the trucks out so that there's not a problem with them having to run to a bank for change to break $20s, etc. It also makes the lines go faster.
The last thing isn't really a tip because it happens naturally at these events - Make friends with those around you. In fact, this is one of the things I love best about food trucks. People socialize while in line and waiting for their food. There's a camaraderie that is so awesome. When was the last time you chatted up all the tables around you at a restaurant? Nope, it's food trucks that create this social atmosphere and that we want more of here in Sacramento.
Have a great time!