I hopped in an Uber the other day after totaling my car, on my way to CarMax to pick up my new one. Funnily enough, my driver told me he was in the cargo van business. I asked him how he found his loads. He said airports. He knocked on doors going warehouse to warehouse outside the Atlanta airport and found one that needed airplane tires transported short distances (about 35 miles). That warehouse gave him a contract to move two loads a day, five days a week, hauling airplane tires to a maintenance facility at the airport. So why can't other cargo van carriers do the same thing if they live close to an airport and go knock on some doors? What about car dealerships, or smaller shops that need tires moved?
The second money-making model he told me about was using the cargo van as a dumpster substitute. Because of HOA rules, some neighborhoods don't allow dumpsters in driveways for longer than 5 days during renovations. So he calls real estate agents and tells them he has a cargo van available for rent — when a home needs renovations, the agent calls him and he parks it in the driveway. The cargo van is producing income without putting heavy miles on the unit.
Finally, try local furniture stores or Home Depot. People are always buying items too big for their cars. The stores will want to connect with you, and when a delivery needs to be scheduled, they'll call you with the details.