Books in Pop-up Trucks at Work series

A dump truck wants to help build the road to the tunnel the way the other construction machines do

A little fire truck finds that he is too small to help put out a fire, but he soon finds a way to be a hero

A bulldozer finds it hard to work in the rain, until he discovers that the storm has weakened the dam and all the traffic is in danger

A tow truck sees all the trouble that a speeding sports car can make