The running gear works as a complete system. A higher-rated individual component does not automatically increase the vehicle’s approved capacity.
Axles support and locate the running gear. Hubs and bearings allow the wheels to rotate, while suspension manages movement between the wheels and vehicle structure. Brakes, tires and wheels each have their own operating requirements and ratings.
Leaf-spring and torsion arrangements are different systems with different service needs. A component name alone does not establish off-road capability or suitability for a particular load.
Assess the approved vehicle configuration as a whole. Replacing one part with a higher-rated alternative does not automatically raise the vehicle’s permitted loaded weight.
Electric and hydraulic braking arrangements require compatible controls and equipment. Identify the installed brake type, controller requirements and vehicle connection before confirming compatibility.
A breakaway arrangement has a different purpose from the normal service-brake controls. Its inspection and testing should follow the instructions for the complete installed system.
For a braking concern, record the controller indication, trailer identification and circumstances. Do not continue using a vehicle with an unresolved braking fault.
Use the vehicle placard and applicable manufacturer instructions to determine the required cold tire pressure. The maximum pressure on a tire sidewall is not a universal operating recommendation for every vehicle.
Inspect tread, sidewalls, valves and the spare. Look for abnormal wear, cracking, bulges, damage, embedded objects or evidence of pressure loss. Low mileage alone does not establish tire condition.
Changes in handling, vibration or repeated pressure loss need investigation. Tire damage or loose running-gear components should be assessed before further travel.
Record axle and hub identification, brake type, tire specification, wheel details and relevant serial numbers. Photographs of labels and the installed arrangement help avoid ordering an apparently similar but incompatible part.
Use the maintenance schedule for the exact components and operating conditions. Service intervals from another axle or trailer should not be copied without checking applicability.
Inspection, adjustment and replacement procedures should follow the component manufacturer’s instructions and be performed by appropriately qualified service personnel.
These guides explain general principles. Equipment, ratings and procedures vary by model and configuration. Use the documentation supplied with your vehicle and installed components for model-specific decisions.
