In a move that would have made MacGyver proud That Andy took a wire grid livestock panel (we use them when constucting hay feeders for the sheep) and fabricated an inner barrier which will keep young ram noses off the window screens and away from the back window and wiring for the truck tail lights.
He cut out gridwork to accomdate the wheel wells and gave the panel a bend to allow for the curve of the cap.
I managed to secure the wiring in an empty plastic bottle and used duct tape to hold it securely. Once the back 'door' panel is in place the lambs will only be able to nudge the bottom of the bottle. Better to prevent a problem than try to explain to a state trooper why my turn signals don't work.
So, gridwork panels on both sides, but not toward the cab of the truck as it doesn't seem likely that they will be crazed and try to crash through. Plus, the backseat will have enough stuff piled up that it won't look very inviting to a sheep. That opens up a lot of floor space in front of and behind the wheel wells that will make all the difference for animals travelling a long distance.
The two back panels overlap by about six inches. The larger one on the right is tied such that it's in a fixed position. The smaller one on the left will swing open for loading and unloading and to put a water bucket in during rest stops.
Put some nice deep straw bedding down and I'd be happy to travel in there myself.