Testors did release a number 1/24th scale car kits with meta bodies and other parts. These were mostly street rods and of course the trailer. Their most complex metal kits were released under the Licoln Mint label. The 69' Judge GTO was really well detailed. They also did a number of Ford pickup trucks.
They also sold some large scale metal engine kits. Some are still available from Round Two under the Hawk label.