A method for determining the wheel load or axle load of an air-sprung vehicle by measuring the internal pressure of the air spring, wherein the wheel load or axle load is determined using a pressure curve which represents the relationship between a bearing force acting on the air spring and the internal pressure of the air spring, characterized in that starting from a wheel load or axle load determined by pressure measurement, using an original pressure curve of an air spring which has been newly brought into operation, further pressure measurements are carried out using pressure curves which, in comparison with the original pressure curve, show a change reflecting the aging of the air spring.

A trailer is disclosed, including a tongue portion configured for connection to a tow hitch of a vehicle, and a spine portion connected to the tongue portion. The trailer further includes a frame structure with a plurality of lower crossbar members transversely connected to the spine portion. The lower crossbar members define a first cargo support level. A plurality of upper crossbar structures are connected to the frame structure above the first cargo support level, and define a second cargo support level elevated above the first cargo support level.

A trailer having a liftable first axle and an air suspended second axle includes a controller, a first valve coupled to the first axle and a second valve coupled to the second axle. The controller receives an air suspension exhaust request signal and a pressure signal from an air suspension bellows coupled to the second axle. The controller transmits an air suspension control signal to the second valve in response to the air suspension exhaust request signal and transmits a lift axle control signal to the first valve to lower the first axle in response to the pressure signal being less than a predetermined pressure value.

A height adjustable transporting trailer includes a main frame, a plurality of left wheel assemblies, a plurality of right wheel assemblies, and a hydraulic system. The plurality of left wheel assemblies and the plurality of right wheel assemblies are pivotally connected to a rear section of the main frame through a fixed end of a control arm. A free end of the control arm retracts and extends the plurality of left wheel assemblies and the plurality of right wheel assemblies with a hydraulic cylinder of each left wheel assembly and each right wheel assembly that is operated through the hydraulic system. Resultantly, the height adjustable transporting trailer can efficiently load/unload a manufactured house as the main frame can be lowered and positioned underneath the foundation of the manufactured house.

The present invention provides various devices and systems comprising a controller in connection with a first deployment mechanism to raise and lower a first lift axle on a wheeled vehicle, and in some cases a second deployment mechanism in connection with the controller for raising and lowering a second lift axle. A fail-safe mechanism is provided that automatically lowers the lift axle(s) if the controller is not receiving any electrical power.

An axle cartridge member receives a pair of torsion stub axles at opposite lateral sides thereof. The torsion stub axles include elongated axle housings, which are sandwiched between two parallel plates to align the torsion stub axles with respect to one another. The cartridge member includes a central arch extending between the two torsion stub axles, which can provide additional ground clearance when the axle cartridge member is mounted to a trailer.

This invention relates to a chassis system for a vehicle comprising a frame configured to support a body of the vehicle. The frame comprises a pair of outer longitudinal members defining outer lateral sides of the chassis system. One or more suspension systems are connected between each of a plurality of wheel mounts and the frame, the wheel mounts configured such that the chassis system is supported on at least one pair of wheels. The outer longitudinal members are positioned on the outside of and adjacent to the wheels when the frame is in a ride position. The suspension systems are configured to selectively vary the height of the frame between the ride position and a raised position in which the outer longitudinal members are at a height above the top of the wheels.

Certain aspects of the present disclosure provide a trailer, including: a chassis and a plurality of positioning assemblies, each positioning assembly including a positioning arm configured to move between a first position in which the chassis is in a lowered position and a second position in which chassis is in a raised position.

An independent suspension assembly for a vehicle, said assembly including: a suspension arm pivotally attachable at a first end to a point fast with the vehicle; a support member for rigid attachment of a lower end of a resilient member at a remote end of the suspension arm the resilient member having a remote side and a near side, the remote side being further from said point than the near side; and a pivoting mounting assembly attachable to the vehicle for attachment of an upper end of the resilient member; wherein pivoting of the suspension arm causes the resilient member to elicit pivoting of the pivoting assembly for minimizing a difference in lengthening between the remote and near sides of the resilient member.

A torsion axle assembly for supporting of a vehicle body on an undercarriage, including an elongated inner member having an inner member longitudinal axis; a torsion arm interconnected with the elongated inner member and the undercarriage; an elongated enclosure interconnected with the vehicle body and having an interior space; and resilient polymeric material residing within the interior space to support the elongated inner member within the interior space, such that the inner member longitudinal axis resides at an unloaded camber angle to an elongated enclosure longitudinal axis when none of the weight of the vehicle body is borne by the torsion axle assembly and at a loaded camber angle when the weight of the vehicle body is borne by the torsion axle assembly, such that the unloaded camber angle is greater than the loaded camber angle. A vehicle having such a torsion axle assembly and a method are disclosed.