When shopping for a boom truck, plan ahead to purchase from a private seller or a dealership. A private seller needs additional care to avoid potential problems with the vehicle, while a dealership is more reliable because the company is in the business of providing customers with efficient vehicles.
Before finalizing a purchase, contact a third-party mechanic, and have him inspect the vehicle for glaring issues. Some surface damage and mileage issues are relatively negligible, especially for shoppers planning on additional body work, but major problems may cost more and reduce the longevity of the boom truck. Ask about the mileage, and inspect the condition of the engine.