Try a Belgian Mal
The problem with those dogs is they don't have an "off" switch like Shepherds do. They're super intense and they rarely slow down. A Shepherd will spring into action at the drop of a hat but just as quickly will shut off and lay down for 10 hours and not think twice about it. It's one of my favorite traits about a Shepherd.
I've done a lot of reading about those dogs and anyone that's gone from a shepherd to a Belgian Mal all said the same thing - they just never go "off duty". They're just so super intense.
Truck drivers who regularly pick up from or deliver to the shipping ports will often be required to carry a TWIC card.
Your TWIC is a tamper-resistant biometric card which acts as both your identification in secure areas, as well as an indicator of you having passed the necessary security clearance. TWIC cards are valid for five years. The issuance of TWIC cards is overseen by the Transportation Security Administration and the Department of Homeland Security.
Bud, I'd have to disagree with you on the whole "turn yourself into a weapon" thing. The best way to keep yourself safe at all times is to not resist. Companies preach this exact thing all the time, "Money is replaceable, people are not."
On the subject of dogs. I personally wouldn't bring a dog simply because it would take time out of your day to have to care for them. To me, it would just be one more distraction on the road, even if it means missing my fur babies every single day. But if you're determined to bring a dog, I'd probably stick to at most a medium sized breed like a heeler that would be easier to maneuver in and out of the cab than a large German shepherd or pitbull.
If you're just looking for companionship, I've seen truckers with chihuahuas, poodles, shi tzus, and other foo foo breeds, probably for easness and lack of real space for a big dog. Or you can also try a cat, but they gotta be inside an inside cat and you'd need to be mindful of where they're at while entering/exiting your cab.
Some very good advise has been given. The one other thing is that companies that allow pets put limits on size, breed and quantity. Working dogs,like your GSD need plenty of exercise and regular training. If you have never worked with or trained a dog for that kind of work, make sure you know what you're getting into. Another thing to consider, all dogs are naturally protective of their owners. A mini Schnauzer is a hair dog, so shedding is more like a human. They are good protectors, won't take up to much room in the truck. They are also fairly intelligent. Just another option. Having a pet in the truck has it's own challenges. What if it gets sick or injured? Now you have to find a vet some place close. How do you get the dog there? What if he just has diarrhea or pukes all over the floor of your cab? I love dogs. I have two at home. I may take one or both with me at some point, but not right away. I will have enough to deal with without worrying about them.
Dogs make great trucking companions. There are several YouTubers who have dogs on their trucks. Most are small to medium sized. How much room the dog will have is something else to consider. I hope that what I and everyone else has said here helps. Good luck.
I have heard of some truckers who took out the passenger seat to make room for the dog
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We have a Chocolate Lab and a Boxer with us on our truck, the lab is almost 3 and the boxer is only 8 months and they both jump up catching the steps as they go up with no problems. The lab has been doing this for over a year now and taught the boxer how to do it. We just make sure the seats are all the way back and the steering wheel lifted all the way up if getting them in on the driver side. Hope this helps.