Match the tractor to the combination
Document trailer type, expected gross combination mass, load profile, distance, gradients, road quality and speed limits. Check that the fifth wheel, axle configuration, gear ratios and braking system fit the trailer and the local operating environment. The legal gross combination mass is determined by the destination jurisdiction and vehicle documents, not by a generic catalogue number.
Review powertrain and serviceability
Ask for engine and gearbox identification, power rating, axle ratio, emissions information and service history. Confirm parts availability, diagnostic capability and technician familiarity in the destination market. A higher power rating is not automatically better if fuel quality, route profile, operating cost or local service support points to another specification.
Inspect coupling and braking systems
Check the fifth wheel and mounting points for wear, cracks, repairs and secure locking. Inspect air lines and electrical connections, brake components, tires, steering, suspension and warning lamps. The UK DVSA walkaround guidance is a useful example of vehicle checks, including warning lights and service-brake operation; apply the rules that govern the intended market.
Build a combination compatibility sheet
Before selecting horsepower, list the trailer coupling standard, trailer axle arrangement, expected loaded combination mass, route gradients and available braking connections. Ask the supplier to fill in the tractor wheelbase, fifth-wheel position and rating, axle ratio, gearbox and brake interfaces. Have the local operator confirm the combination against destination weight and registration rules.
Sources and further reading
This practical guide is an original summary based on the references below. Rules and technical requirements vary by market; verify current local requirements before purchase or export.