@AKUtrecht For what it's worth, some squatter friends in London got quite far with a large speaker stack, amplifier and some old car batteries strapped onto a handtruck (and after a tire blew, into an abandoned shopping cart). Kept running for many hours without trouble, and people just alternately plugged the 3.5mm cable into their device.
May be more practical than a cargo bike, as it's easier to maneuver (especially the handtruck), and doesn't need to be dismantled after use? Strapping a spare wheel to it would probably be a good idea though, turns out it's very annoying to find a spare handtruck wheel in the middle of a street :p
@AKUtrecht Ah, good point. Would a handtruck-mounted system not still be transportable in a cargo bike, though? A shopping cart probably wouldn't be...
@joepie91 Oke, nice. We are familiar with shopping cart soundsystmen. We done that often with also squatter friends, building small partys in parks. But if we need to move fast, a Cargo bike is nicer.