Testimonials Press Links Contact       Pieces     Stool to trolley     Attaching the bass     Trolley to stool     Rolling     Sitting How it works Attaching the bass 4/8 The bass is raised to upright position.   I travelled around and visited musician friends and brought my bass along. In total I travelled almost 3000 kilometers with train and bus, something that wouldn't have been possible without my Double Trolley! Daniel Duzlewski Örebro, Sweden   More reviews.. © 1999-2016 Double Design of Scandinavia AB, Sweden, Tel +46 707 18 16 20,