There are ones near me built into normal police SUVs, branding and all, with a tower sticking out the top of it, containing cameras and lights. I usually see a couple a day, and they move periodically. I almost wonder if people petition (or just straight-up pay) to put one of these things in their neighborhood to deter or try and identify individuals accused of criminal activity.

Edit:

Article the image was pulled from.

So it might be stationary now, but only because it seems abadoned or it is not getting any/enough maintenance lately. I think in theory it should have moved a while ago or it may be some sort of trick to fool ordinary people so they assume the police presence at this site with this "equipment" is a response to a temporary actual or declared state of that particular area.