Practically noone in Germany uses an SUV as a commercial vehicle. That's because they suck at being commercial vehicles, you want something like a VW Transporter, either as minivan or flatbed. If you need 4WD (which you generally don't) may I interest you in an Unimog.

They'll also have commercial markings on the side, in the sense of "Wifey's cleaning service ". Easy to distinguish.

Now, I have to be honest, my sister drives a SUV, and even a 4WD one... though it's small, definitely by American standards. That's because she's hauling horses around and doesn't want to drive a Unimog when grocery shopping. It's like the one instance where having a sports utility vehicle actually makes sense, most people driving them neither use them for sport or utility, only as a vehicle. And noone's going to flatten her tires as she's living in a village, not some posh neigbourhood where the other kind of cars are Porsches and S-Classes. If you see a Lamborghini there it's a Tractor.