Is it suitable to take a trailer for a long-distance bicycle trip?

Of course in theory, but it's a bit far, and there will definitely be mountains and roads in the middle. In that case, it will be troublesome to carry the car. If it is completely on the road, it should be feasible. I once wanted to get a car, a pet dog or a big bag. Later, it was not practical, too ostentatious. I think it's better to give up your backpack according to your route.