You can get a sole trader policy that'll cover you to drive and ride anything.
However.
You will be saying to the insurance company that you are a motor trader. You will have to prove you buy and sell vehicles if required. If you can't, your screwed. I deal a lot with sole traders, or those who claim they are and who haven't bought or sold a vehicle in years. In every circumstance, the insurance company refuse cover and it's bye bye car!
It used to be an easy way of getting a policy and the companies would cover anything. Not any more. It's just too expensive when claims start coming in.
Pete