Here's a video of the Bruder Caterpillar D4 conversion pushing some rocks around in teh driveway. There's a point in the video, where I had to stop & make some adjustments on the radio settings. Since IDK how to edit video's......YET, there is a pause in the action. There is a LOT of background noise, as my residence is extremely close to Interstate 5.
https://youtu.be/qPp71u7zIqY