There are many different types of fire trucks out there, ranging from vehicles built on a pickup truck chassis up to the articulated hook-and-ladder trucks. What the turn radius will be is dependent primarily on what the wheelbase of that vehicle is.
Depends entirely on the truck.
Type your answer here... 50'
Measure from the point the trailer connects to the truck to the center of trailer axle ( if a tandem axle trailer measure to the center point between axles) multiply by 2 and this will have you close to turning radius.
Volvo
36 feet
An articulated lorry is a truck and trailer - a combination involving a tractor unit and a semi-trailer, known in the United States as a semi-trailer truck.
Semi-articulated
Semi
20.6 ' turning radius
There is an inside radius and an outside radius. Both are the radius of the curve required by the car to maximize the turning capabilities of the vehicle. The variables are the length of the vehicle and turn angle of the tires relative to the body of the car. So a typical car would be much less than a large truck. All makes and models vary.
Varies according to wheelbase of the power unit, and the bridge length between the drive axles and trailer axles.