I am currently trying to source a set of upgraded tailgate gas struts. The 2014 Vito 114 VTS/L I own was recently fitted with a Mercedes 4 bike carrier. Unfortunately the rear door will not stay up with the bike carrier fixed and with no bikes attached. I can lift the door easily but the door closes without me holding it. I have spoken to Mercedes and they do not have uprated struts. Does anyone know where I can buy a set of upgraded struts from? Thanks.