Sides for this can be purchased under SKU code 11137 @ $125 for a pair. 
https://www.caravanconnection.co.nz/product-page/side-panels-solar-4000-2-pce
 
Planning a caravan getaway this summer?
 
Be sure to take this Inflatable Caravan Sunshade with you.
 
Made from a durable, waterproof 1500 Oxford PU fabric, it keeps you sheltered from sunshine and rain.
 
Designed for easy up, it inflates in 6 minutes with the included pump.
 
When it's time to pack up, it can be placed in the included storage bag.
 
Includes:
Guy lines, pegs, hand pump, and storage bag
 
Dimensions:
• Width:400cm
• Depth:250cm
• Rail height: 235-250cm
• Front height: 235cm