Making a web seat for an innertube in 7 minutes

Watch Juden Bilgera from Sitio Baybayatin, Lagayan, Abra, Philippines make a rope web seat for a truck innertube.
The tubes are used for whitewater tubing down his local river called Palsuguan River. There is an hours hike upriver to the beautiful Ar-arbis Falls with a return 30 minute whitewater tubing experience.
Just one of Abra's popular adventure tourism destinations.

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what size tire and rope do you use? And how long the rope?