Nils, the table is somewhat slippery and it is not the best place for a video but it is what I had available. After mext weekend I will see if I can drive it on some of the roads at my eork, the inactive ones still have rubber paint on them which slowed car system vehicles through friction with the magnet. Since them all finctio al toads have been repainted with faller paint and it makes a huge difference. As for a differential, I wish I had one but there is no space :( if I limit the steering angle it drives just fine but tight turns stop it. I have checked the wheels and it appears the fenders (wings) do not affect them. I also have 3 pieces of lead shot undrr the hood for ballast, any more and the drive wheels will lose more grip.
Sebastian, the tires are not slipping on the rims, and I have glued with CA the wheel that was slipping on the axle. Sadly the faller audi a6 tires are just too small or I would be able to use them. I will look into using heat shrink tibe for better traction