It was at the Hollister Hills State Vehicle Recreation Area (SVRA) in California. The blocky electric truck didn't impress as it showed difficulty turning and gaining traction on the SVRA's "The Steps" section.
Fast forward to today, Ford CEO Jim Farley posted a clip on X showing the F-150 Lightning giving the same stretch of trail a go. Compared to the Cybertruck, the Lightning managed to avoid loss of traction on the very same turn. Its tires squealed a bit on the uneven uphill passage, but generally, it did it smoother and faster than the Tesla could.