pop up pooper and arthur

Hi guys. Was out mooching for some essential items to add to our camping kit. Was really keen on getting a pop up pooper. However when seeing it in the flesh (and having a test sit on it) my knees were not happy about how low it was. "Arthur" is now an unwanted companion to our travels. Does anyone have an easy stable way of raising it up? Dont really want a chemical toilet as dont have the room. Liked the idea of the "p u p". Any ideas? Thanks doc.