C-Line and G-Line in loose, deep pea gravel

Ever wondered how a Brompton would cope in really loose, deep gravel?

Seth from Berm Peak Express built a gravel pit and tried the C and G Lines, along with a gravel bike, MTB and the utterly ridiculous Surl Moonlander with it's 6.2 tyres. (Bromptons are up first)

https://www.youtube.com/watch?v=KdqOr8hgxpo