I've seen that type of service around here. They come to large office buildings, and set up a lane in the parking lot. People drop off their cars in the morning, and fill out the paperwork. By the time they get off of work, the car is waiting for them with a fresh fill of oil.
They pull the cars up into the truck via ramps if I remember right.
There are a few of them here. Not in those type of trucks though. They pull a trailer behind a pickup, completely stocked with tools, oil, filters, jacks and what nots. Travel to schools and offices. Might be a good business venture for someone on this site. The customer wont know the difference other than having their oil changed while they go about their daily routine, but the oil change will be done correctly and with care.