Get Video Thumbnail in RSS feed

Hi dear people,

On the website Spreekjemee.nl, i am using the plugin Video Thumbnails (version 1.7.4) to automatically draw featured images from video posts. It works like a charm :). Now, i’d like to have these images displayed in the RSS-feed. I have the rss setting in WordPress set to Full post, but the image is not showing. Any help is greatly appreciated!

Thanks!