Hello! Can the retrofitting of a coupling with condition 1 be agreed? And if yes: What must be considered? I ask here because my Mazda 323F is treated like a classic car and the preservation of condition 1 is very important to me. Nevertheless, I would like to pull a caravan (Tabbert Comtesse BJ 1978) with it. If necessary, I also agree to make changes if they are absolutely residue-free. MfG Meehster