> For example, a Mercedes Sprinter in the standard long box configuration (as is used by local grocery delivery services, plumbers and the likes where I live) is 7.4 meters long , way longer than even the longest American pickup trucks (for some of them, several meters longer!), and is just as wide as them.

Seems correct on relative length but not width; the F-450 Super Duty body is a bit wider without mirrors than a Sprinter with mirrors;