The Rattlebang Picnic by Margaret Mahy illustrated by Steven Kellogg*

When Mr. and Mrs. McTavish marry, they make a huge decision-do they purchase a fancy, expensive car or have a large family?  They choose a large family (seven children) and purchase a rattlebang car.  In this car, the family and Granny McTavish like to go on picnics.  One day they decide to venture onto the tip-top of Mount Fogg for a picnic.  As they ascend to the top, pieces fall off the rattlebang car.  A very exciting adventure awaits them at the top!
*Highly recommend.
A fun read with Mr. Kellogg's humorous illustrations.
Guided Reading Level: N (beginning of 3rd grade)
Grade Level Equivalent: 4.6