Hello, my transit has put a little rust down below. no rusting, quite superficial everything. Now it should come still so 2, 3 times through the Tüv. Should I do a little more effort here, or would it be enough here if, for example, I went once a year with some fluid film? Or maybe all with Fertan infiltrate? A complete resealing at the specialized plant (safe > 1000€) is too expensive for me and I don’t think that’s worth it The whole back is the trailer coupling.. that consists of almost 1cm thick steel.. there is therefore rust relatively no matter Transit Box BJ 2007 150Tkm