A cheaper van isnt necessarily false economy mate. It will enable you for a short period to increase your income dramatically helping you to save for the all important permanent system. I first went down the trolley route, lot more inconvenient than van mount but enabled me to increse my earnings by about 80%.
I worked out of a car with that too, thought about a hatchback? £600 for a motor, £1,000 for a trolley system, there you go, already youre earning shed loads more due to increased output, and getting to save lets say £150 a week?