The kobuki base on your own will not drift, so it is smart which the tilted inertia causes the drift. Needless to say I'm able to hack my URDF that has a weightless superstructure, but I wanted to resolve this in a more reasonable way. I tried all I can https://www.uk-exhibitionstands.co.uk/product-category/pop-ups-and-banner-stands/pop-up-stand/