Maintenance on your fleet can be key to profitability. Preventive maintenance can head off costly repairs down the road. Have a professional mechanic check the vehicle for possible problems on a weekly basis. Also, key your driver in on this process too.
Let your fleet vehicle driver know that his truck is his lifeline to success in the field. If the driver is made to feel like he is part of the process he/she will be more likely to let you know when there is something different about a vehicle. They drive it everyday. They know what it should run or drive like.
Preventive maintenance can be a key to a profitable on-call/mobile repair or service business. Prevention of a weeks downtime to replace an engine or transmission can certainly save thousands on lost production and thousands of dollars in repair costs.