When buying a box truck, there are several things to consider:

1. Purpose: Consider what you will be using the truck for and what size of truck you will need. This will help determine the type of box truck you should buy.
2. Capacity: Consider the payload capacity and the size of the cargo box. Make sure the truck can accommodate the size and weight of the items you will be transporting.
3. Engine: Consider the type of engine that is best for your needs. Gasoline engines are less expensive to purchase, but diesel engines are more fuel-efficient and have a longer lifespan.
4. Transmission: Consider whether you want an automatic or manual transmission. Automatic transmissions are more convenient, but manual transmissions are generally more fuel-efficient.
5. Maintenance: Research the maintenance requirements of the truck, including how often the oil needs to be changed and the cost of replacement parts.
6. Price: Compare prices from different dealers and consider the overall cost, including the purchase price, insurance, and maintenance.
7. Brand and Model: Consider the brand and model of the box truck, you can research about the reliability, resale value and the availability of spare parts.
8. Inspect the truck: Before making a purchase, inspect the truck for any damage or wear and tear, and ask for maintenance records.