In a previous log I mentioned that the wheel suspension of my Wild Thumper was too weak to handle a 1.5l bottle as load. Indeed the suspension can be strengthened but this requires to disassemble the full chassis. Since I was not very happy with this situation I replaced the default springs with some tuneable damper from RC-cars. The ones I bought are labeled "Dual Spring 80 mm Scale Black Shocks":

I replaced their default springs with some stronger ones and assembled them into the chassis. Now the suspension can be adjusted a bit easier: