On-Site Fleet Service, Inc. has been in business since 1978 and grown into the largest non-dealership professional diesel and school bus repair provider in the state of New Jersey. On-Site offers a complete menu of maintenance programs for school buses, medium-duty trucks and heavy-duty trucks, including computerized preventive maintenance, brakes, clutches, engines, transmission rebuilding, and road service. We can also offer the individual truck owner the type of service and attention that a large fleet would receive.