Access Cab Dog Barriers

I've searched but not found any ideas that seem like they'd work for me. I have a big dumb doberman puppy that thinks he needs to lay on our laps in the truck like he does on the couch. He no longer fits. He's strong and determined and none of the barrier ideas I've seen look like they'd work. Many seem flimsy/too short.

What have you guys done?

 

Sorry! I've got a IG "Italian Greyhound" she just stays in my lap with no problems. But I've seen a lot of stuff in access cabs in here you'll just have to hunt for them, seen a lot of stuff in "what have you done to your 2nd gen tacoma today"! I liked this one it is in "Access Cab Dog Platforms UPDATE" and there are more there.