Before attempting to install a car seat, you should:
* Check the owner's manual for both the vehicle and the car seat: These manuals will provide specific information on whether the car seat is compatible with the vehicle and any limitations.
* Measure the space: Measure the width and depth of the back seat area to see if the car seat will fit. Consider the size of the car seat base and the need for additional space for installation and the child's comfort.
* Attempt a test fit: If possible, try to fit the car seat in the truck before you need to use it. Make sure the seatbelt or LATCH system works correctly and the car seat is securely installed and the child is safely secured.
In short, while *possibly* doable in some models, it's not guaranteed and likely unsafe in many small extended cab pickups. It is generally not recommended and a larger vehicle is often a better choice for car seat safety.