Good morning,
I've spent 20 years in Gemany off and on. My last tour, I had just bought a Choo-Choo Customs stepside and came down on orders 2 months later. I took it with me, drove the Ish out of it for 3 years and sold it for more than I owed.
First, Germans love american pickups! Everytime I parked it somewhere, I would come back with a couple of people wanting to ask questions or just talk about my truck.
The new TUV rules can be a problem for older American vehicles. If your truck meets the latest US emission standards you should be good. Afterall, Military new car sales is selling new vehicles for delivery in country as well as back in CONUS. Reach out to them on the Exchange web page and get their input.
Getting around can be difficult at times, parking "on the economy" was the biggest issue I experienced. Depending on where you go, you may have to park away from your destination and walk or take public transportation.
I ******* traffic in center city Wiesbaden for almost an hour when I tried to park in the underground lot. Didnt know there was a 90 degree right at the bottom of the ramp and had to inch back and forth to get around it. Rinse and repeat to get out. The Germans were very helpful in "spotting" my sides and corners and only a couple of people looked at me in disappoval.
As to having Service done, AAFES has a garage at most Exchanges. Bases usually have a "do it yourself" auto repair shop with tools and people who will help you. On the economy, you will probably find one or two shops who are willing to help as well.
There are a couple of FB groups you may want to join. Ask a question and people will be very helpful.
US ARMY GERMANY (USAG)
US Army in Germany
USO Grafenwoehr - reach out to me at my email, I know the USO Europe Director who lives in Graf. I can do the introductions and you can ask questions directly.
USO Kaiserslautern
Get out and see Europe, meet the people, eat the food, careful with German beer in the beginning
and Enjoy your Tour!