Questions about LEGO Remote Control Tracked Racer

Hello I have bought the LEGO Stunt Racer (42095) and the LEGO Tracked Racer (42065). Unfortunately, only one remote control works for both vehicles. Can anyone help me? I would be very happy... Setting the same number on the remote control and on the big "motor" where the batteries are has not helped either; like setting the Racer 42095 to 1 and 1 and the Racer 42065 to 2 and 2 but it still doesn't work. Many thanks in advance

Is the remote control included or do you need the additional tuning set? How much do the additional rubber studs cost? Thank you for an answer.

Hello, I would have to buy 2 units. If both vehicles are in the same flat, will there be problems with the control system (same frequency)?

Again to my question: I read in the reviews: "Unfortunately again no rubber studs for the tracks are included, so the vehicle has no grip depending on the surface. But they can be ordered as a spare part." Question: Where can I order the rubber studs? Thank you!

How fast does this thing go?

there is shipping