TOMAH, Wis. -- Some of the biggest and best trucks and tractors are back in Tomah this weekend, to see just how much weight they can pull.

The annual Budweiser Dairyland Super National Truck and Tractor Pull is taking place all weekend at the Tomah Recreation Park.

More than 400 people from all over the country are putting their engines into high gear for the competition, and these are not your average "on the farm" trucks and tractors.

Some of these pullers spend hundreds of thousands of dollars, trying to make their engines as powerful as possible.

The event attracts thousands of spectators each year and organizers say it drives in about $15 million dollars.

"In the economy that we have today, these kinds of things are so important for the overall economy, especially of a community of this size, said Julie Zebro of the Monroe County Agricultural Society. So you need to be able to bring something to town so that they have a successful year and so that they stay in business."

Coordinating an event as big as this pull takes quite an effort. The only reason this event is even possible is because of the volunteers.

More than 200 volunteers spend their time working to make this event run smoothly and they say the experience they have during these four days is worth more than they could ever be paid.

I do it because I could not do it, said David Hall, a volunteer.

The truck and tractor pull is something Hall looks forward to every year.

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More than 200 volunteers make annual truck and tractor a success