iFrame not resizing in desktop

Hoping someone can help me with getting the iFrame Resizer plugin (https://github.com/davidjbradshaw/iframe-resizer) to work correctly.

• My test page is: http://www.chapmancaravans.com.au/new-used/test.php
• The iFrame content has the iframeResizer.contentWindow.min.js script added
• I am using the typical setup

When I view the test page on a device (mobile/tablet) it works great. But when I view it on a desktop and reduce the browser window - the iFrame is cut off and does not resize at all.

Does anybody have any suggestions on what I might be missing here?

Thanks so much.

Just had a look at your page and the iframed content does not have the iframe.contentwindow.js file loaded into it.