on my '88 i found a child seat that would sit on the jump seat, had it behind the drivers seat, threaded the seat belt through it and also had a couple of those heavy rubber tarp straps, was secure as could be, probly the safest seat in the truck. didnt worry one bit about the "legality" of it all. once my child was too big for the car seat she just sat in the jump seat. she's 19 now and wont hardly fit back there now. when we would go on a long trip she would ride in the bed. (have a cap, always have) she could streach out , read, whatever. never had a problem.