How many wheels are there on the trailer of an "18-wheeler" truck?

More Questions:

Each Pac-Man maze features 240 regular dots and how many larger "power pellets"?

What is traditionally hidden in a Mardi Gras king cake?

What got its name from a Bridgeport pie company's name and lightweight pie tins?

What year was the first iPad released?

In the Winnie-the-Pooh stories what is Kanga’s baby called?

What year was Winnie the Pooh "born"?

The novel "Gone With the Wind" was written by who?

Which US state is home to Joshua Tree National Park?

Kat Dennings and Beth Behrs play the lead roles in what CBS TV show?

What famous fashion designer did Rachel begin working for in Season 5 of the TV show "Friends"?

In 2007, what morning network TV program expanded from three hours to four?

In the TV show "The Simpsons', what is the name of Springfield's comic book store?

During later seasons of his show, what TV show title character worked for Neverendingstore.com?

What did the band The Clash rock?

Which amendment to the US Constitution deals with the income tax?