A trailer assembly suitable for carrying a container of proppant has a frame with a first side rail and a second side rail extending in generally parallel relation to each other and a plurality of wheels rotatably mounted below the frame. The frame has a plurality of cross members extending between the side rails. First and second outriggers extend across the side rails so as to each have one end extending outwardly of one of the side rails and an opposite end extending outwardly of the other side rail. The first and second outriggers are suitable for receiving the container of proppant thereon. The frame has a first section positioned above the wheels and a second section positioned at a level lower than a level of the first section. The proppant container is placed on the first section.

A portable towing system for a motorcycle or similar vehicle, such as a trike, the frame of which can be lowered to ground level to facilitate loading of the motorcycle or similar vehicle by pushing or riding the vehicle onto the frame without risk of the vehicle falling off the sides of a steeply inclined ramp. The towing system may be assembled, raised, lowered, and disassembled by a single person, if desired. The towing system also comprises a cargo box to store the frame when disassembled. The raising and lowering of the frame is effected by a lifting and lowering mechanism connected with the wheel assemblies, and at least three heights of the frame are achieved by rotation of the lifting and lowering mechanism of the wheel assemblies. The cargo box and the frame can use the wheel assemblies interchangeably.

A trailer configured to lower an overall center of gravity. The trailer comprises a tank, a wheel assembly, an upper body height and a trailer length. The tank comprises a cavity contained within a lower body, an upper body, a transitioning body, a front end and a rear end when the cavity within the trailer is filled with a liquid fluid, the liquid fluid is evenly distributed along the trailer length of the trailer since a diameter of the lower body, the upper body and the transitioning body are equal.

An improved articulated heavy haul trailer combination comprises a trailing accessory vehicle such as a booster coupled to a main trailer by a coupling. The coupling includes a horizontal hinge, a vertical hinge that allows the trailing accessory vehicle to yaw in a horizontal plane, a spreader extending between the hinges and a hydraulic piston and cylinder. A turn sensor mounted on said combination detects yawing, and a controller reduces the piston and cylinder's downward biasing force on the coupling.

An improved articulated heavy haul trailer combination comprises a trailing accessory vehicle such as a booster coupled to a main trailer by a coupling. The coupling includes a horizontal hinge, a vertical hinge that allows the trailing accessory vehicle to yaw in a horizontal plane, a spreader extending between the hinges and a hydraulic piston and cylinder. A turn sensor mounted on said combination detects yawing, and a controller reduces the piston and cylinder's downward biasing force on the coupling.

A cargo vehicle is disclosed having a composite floor assembly with at least one conduit extending along a length of the composite floor assembly. The at least one conduit may include a first internal cavity and a second internal cavity. The first internal cavity may be configured to route at least one vehicle component. The second internal cavity may be configured to receive at least one vehicle component or a plurality of mechanical fasteners. The mechanical fasteners may be used to couple a base rail to the composite floor assembly.

A modular trailer system comprising a plurality of curved panels, where each panel is elongate and has a first side with an angled projection and an opposing second side with an angled slot such that the angled projection of one panel is capable of fitting into the angled slot of another panel, allowing the panels to join together to form a continuously curved surface. The modular trailer system may further comprise a first top rail with an angled slot capable of receiving the angled projection of one of the plurality of curved panels and a second top rail with an angled projection capable of fitting into the angled slot of another of the plurality of curved panels. The plurality of curved panels, first top rail, and second top rail may be assembled together to form an elongate trailer body with a partially circular cross section, such that the trailer body has a continually rounded bottom and sides and an open top.

A modular trailer system comprising a plurality of curved panels, where each panel is elongate and has a first side with an angled projection and an opposing second side with an angled slot such that the angled projection of one panel is capable of fitting into the angled slot of another panel, allowing the panels to join together to form a continuously curved surface. The modular trailer system may further comprise a first top rail with an angled slot capable of receiving the angled projection of one of the plurality of curved panels and a second top rail with an angled projection capable of fitting into the angled slot of another of the plurality of curved panels. The plurality of curved panels, first top rail, and second top rail may be assembled together to form an elongate trailer body with a partially circular cross section, such that the trailer body has a continually rounded bottom and sides and an open top.

A vehicle operational diagnostics and condition response system includes at least an axle supporting a cargo transport unit frame, a suspension disposed between and secured to each the cargo transport unit frame and the axle, a load detection device interacting with the suspension and communicating with a system controller, wherein the system controller is supported by the cargo transport unit frame, and a cargo transport unit health status system supported by the cargo transport unit and configured to communicate with the system controller. The cargo transport unit health status system provides state status information for monitored operational elements of the cargo transport unit.

A rotatable trailer bed includes a frame, a trailer bed, a turntable swivel assembly, and a plurality of swivel casters. The frame includes a bed section, a hitch section, and two wheel sets. The hitch section is adjacently connected a front end of the bed section. The two wheel sets is rotatably mounted to the bed section. The plurality of swivel casters is mounted to the bed section is perimetrically positioned around the bed section. The trailer bed is rotatably mounted to the bed section through the turntable swivel assembly as the plurality of swivel casters maintain the balance and level of the trailer bed.