Hi rickylynne,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
You might think of getting a adjustable curtain rod and using it to go across the opening to keep things from falling out. They are only about 1/2" dia and they are available in different lengths with a compression spring to hold them in place.
Be sure and check out our Heartland Owners Club. Join us at a rally when you can and meet lots of the great folks here and make friends for a lifetime.
Enjoy the forum and your new unit.
Jim M