Our Adria has the waste water tank where the windup spare wheel fitting should be on the ducato. This meant sticking the spare wheel in the garage, not a good place as behind the rear axle and impossible when we have the bikes and all the usual stuff in the van as no space for it. After much head scratching I have finally found a company who manufactured and fitted a drop down spare wheel carrier to fit between two chassis cross member nearer the front of the van. If anybody else has the same problem, the company was UK towbars at March in Cambridgeshire. Pictures hopefully attached........