Hot Wheels Steering Rigs was a line of detailed semi tractor and trailer sets that were released in 1981 and 1982. On the back of the trailer, there was a large wheel on top which could be used to steer the rig. See detail below:

Vehicles in series:

Series #	Year	Name	Notes	Photo	Cab Photo
1915	1981	Kenworth Van
1915	1981	Kenworth Van	France only	White Trailer w/"Hot Wheels Racing Team" on sides	Red Cab
1916	1981	Peterbilt Tanker	Only color released
1917	1981	GMC Hauler		Yellow Trailer w/"United Feed Grain" on sides	Yellow Cab
1917	1981	GMC Hauler		Yellow Trailer w/"United Feed Grain" on sides	Light Yellow Cab
1918	1981	Kenworth Tanker		Silver Tanker Trailer w/"Arco" logo on sides
1918	1981	Kenworth Tanker	France only	Gray Tanker Trailer w/"Arco" logo on sides	White Cab
1918	1981	Kenworth Tanker	Base says "Hong Kong"	Silver Tanker Trailer w/"Arco" logo on sides	White Cab
1919	1981	Peterbilt Hauler		Orange Gravel Trailer w/"Bob's Sand and Gravel" on sides	Orange Cab
1919	1981	Peterbilt Hauler	France only	Orange Gravel Trailer w/"Bob's Sand and Gravel" on sides	Red Cab
1920	1981	GMC Van		Gray Trailer w/"Eagle Trucking" on sides	Gray Cab
1920	1981	GMC Van	France only	Gray Trailer w/"Eagle Trucking" on sides	Red Cab