Hello, I already have a 07 registration number, I wanted to take a matching trailer to the truck on the same sheet metal. Is this possible with the same number? Train and trailer? Do I need a vehicle license and vehicle letter to the trailer? I only have customs documents (made in USA)! Actually, an old-timer report should suffice for this?! Who has experience? Does the vehicle play a role in the 07 class? Can I also use a motorcycle for my truck the same 07 pack? I wanted to hear the experiences of you now, because the aunt may not know at the admission. MfG