Not Permissible: Sorry, no can do. State law says it's not allowed. (Except >5ft)
the state of TN is strict, it is illegal if the car has rear seats, and the child is less than 5ft tall and less than 9 or 10 years old, you can get a ticket for child endangerment.
it is okay on a truck because it doesn't have rear seats. IMO I don't see a problem if the car has the air bag sensors... but government regulates to have power over people in some cases and this is one of them j/K!!! but Hey... you never know, there's always that small chance the air bag sensor could malfunction and deploy the airbag in the event of an accident so you just have to be extra careful.