killing it dude!
We use a belt looped through 5 plastic coat hangers and wear it around our waist and hook to the handle. It is awesome for filming when riding doubles as you can hold the camera with both hands. The filmer rides about a 7 foot longer rope attached to the tube tow point. it turns out perfect every time! the coat hangers break if you fall so its not really dangerous!
you should definitely try it!
Heres a quick clip of it in action, you can see the hook at the beginning
https://www.instagram.com/p/BIiftNPDRsr/