Outdoor was never an option for my wheel type robots.
Just gave caterpillar robot some outdoor activity.
Worked fine until robot drove too fast for me and I tramped on joystick cable, soldering needed.
This is the first outdoor run 90fps slowmo video, uphill with incline of 5°:
This is downhill, remember that youtube video as well as animated .gif show video slowed down by factor 90/25=3.6:
Maybe (in far future) caterpillar robot will drive autonomously my 900m "around house" track. A 5:19min video of that track can be found here (German language page).
Hermann.