Abstract: An engine and high pressure pump are mounted onto a wheeled chassis. High pressure water is distributed to a rotating wand and nozzle assembly on the wheeled chassis so that as the chassis is moved along a linear path, high pressure water is sprayed onto an underlying surface to clean the surface. Optional diffusion plates may be used to prevent high pressure water from being sprayed directly onto the underlying surface in part of the rotational path defined by the wand and nozzle assembly.

Abstract: An engine and high pressure pump are mounted onto a wheeled chassis. High pressure water is distributed to a rotating wand and nozzle assembly on the wheeled chassis so that as the chassis is moved along a linear path, high pressure water is sprayed onto an underlying surface to clean the surface. Optional diffusion plates may be used to prevent high pressure water from being sprayed directly onto the underlying surface in part of the rotational path defined by the wand and nozzle assembly.

Abstract: A single wheel support for a vehicle-towed trailer. The support includes a swivel plate mounted on the trailer for swiveling about an upright axis. An elongate arm assembly is mounted adjacent one of its ends on the swivel plate for swinging about a horizontal swing axis. The wheel in the support is rotatably mounted on the other end of the assembly rearwardly of the swing axis. The arm assembly is biased in a direction opposing the weight of the trailer by a coiled spring compressibly interposed between the plate and a back region of the arm assembly, and by a coiled spring under tension interposed between the plate and a front region of the assembly.