[NicoJuicy]

This won't help in Belgium, where Trucks need to pay "road taxes" and have a device installed for that. They can also get the data for tracking vehicles and they won't need Uber.

Good idea though, but not applicable everywhere

[dllthomas]

Knowing "N people wanted to go from roughly here to roughly there enough to pay Uber for the ride" is information that wouldn't show up in "my truck moved from X to Y" data, and which is potentially hugely valuable to those adjusting public transit.

[kabes]

This is focused on urban traffic. That may be totally different from truck traffic, which avoids (or even isn't allowed in) urban areas.