If you have an extended cab, but the back seat isn't a full bench seat with seatbelts, then the baby can't sit in the back... And otherwise, it's going to be nearly impossible to get a carseat in and out of the back of that type of truck anyway....
If it's a regular cab (or ext. for that matter) the baby can sit in the front passenger's seat if there are no airbags, or if you can turn off the passenger side airbag.
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