An aerodynamic system comprising a torsion tube, a first rotatory coupling coupled to the torsion tube and adapted to mount to a first wheel hub, a second rotary coupling coupled to the torsion tube distal from the first rotary coupling and adapted to mount to a second wheel hub, and a non-rotating fairing panel mounted to the torsion tube.

A tire inflation assembly includes a housing that includes a fluid supply port and at least partially defining a fluid chamber in fluid communication with the fluid supply port. The tire inflation assembly further includes a first valve subassembly operatively connected to the housing and in fluid communication with the fluid chamber, wherein the first valve subassembly is configured to be operatively connected to and in fluid communication with a first tire. The first valve subassembly includes a first fluid valve and a second fluid valve each disposed between and in fluid communication with the fluid chamber and with the first tire. The first fluid valve is configured to open responsive to a pressure differential between the fluid chamber and the first tire, and the second fluid valve is configured to open responsive to pressure in the fluid chamber being greater than a first pressure threshold.

A method of determining a left or right side installation position of a trailer wheel of a trailer connected to a tow vehicle. A number of rotations of the trailer wheel is determined. A number of rotations of a left side tow vehicle wheel and a right side tow vehicle wheel is determined. A first correspondence value between the number of rotations of the trailer wheel and the number of rotations of the left side tow vehicle wheel is determined. A second correspondence value between the number of rotations of the trailer wheel and the number of rotations of the right side tow vehicle wheel is determined. A left side or right side installation position of the trailer wheel is determined based on the first correspondence value and the second correspondence value.