Outdoor mobile media

I have recently established an outdoor mobile advertising company in Stockport, Greater Manchester. I am looking for somebody who will be able to sell the ad space on the vehicle to either local businesses or larger organisations within the locality. As I only have the one vehicle at the moment I am finding it quite difficult myself to promote the service and how beneficial it could be to clients. The van has a scrolling system fitted to the rear thus attracting attention through the movement of the display(s). The vehicle can hold upto 12 fully re-usable banners and, also lights up in the evenings. I currently run the operation in Stockport but I do have some clients in Manchester coming on board in the next few months. The vehicle is ideal for sales/promotions ,new store openings, and awareness campaigns.Thanks.