Question truck ride with class 3

I have to pick up a larger, light item in my private life. I wanted to take the tractor from a friend. The curb weight (weighted) is 10.55t, the load weighs 780kg. I changed the “old” 3 driver’s license to EU, so I can drive up to 12t (real) total weight. The tractor (VOL) is equipped with a digital tachograph with card. Now there are some questions: -Since I am not a professional driver I logically do not have a driver’s card -Does the same rest periods apply to me as a private person? -What do I tell the BAG if I have been checked? -Is the Sunday driving ban valid (only for commercial freight transport)