To take this idea up a notch would be to create an Uber type of service where people can hire a luxury office space on wheels that comes with a driver.
People can get some work done while commuting in a comfortable environment designed with this in mind.
People might need a change of scenery for inspiration - book the mobile office for a day and work from "home" away from home. Maybe somewhere in nature.
Having the experience of building a perfect mobile office and having it fully booked, the natural evolution would be to expand the fleet and accommodate the customers that are waiting in line.
An in house van/car conversion shop
A conversion shop could help people that want to join the mobile office network to convert their vehicles. That way they could pass on the experience and ensure that all the fleet vehicles have top quality offices for the clients.