Rear door water ingress

I Have food some water staining on the offside rear door of our Autosleeper based on a boxer van . This is greater near the hinge side going up about four inches and tapers off down to nothing on the other side of the door. I have visually checked the door seal and can see no obvious damage however if I put a piece of paper over the seal and close the door I can pul the paper out with little resistance which I cannot do on the nearside door which does not leak. This seems to indicate the door seal is not as tight as it should be so I think a possible cure is adjusting the door catch to make the door a tighter fit thus making a better seal. Or perhaps installing a second self adhesive seal on the door to butt against the original seal to close any small gasp. I was wondering of anyone else has had the same issue and whether they found a solution.

Yes, I have this problem on both rear doors (as well as the side door). It has been evaluated by Marquis and we are currently awaiting warranty work to replace all the rubber seals, which don’t appear to be watertight despite adjusting the doors.

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Just an update, I have carefully cleaned all the rubber seals on the rear doors and given them a good coat of silicone. We have had some heavy rain and wind and have had no further leaks. I am wondering if the leak was caused when we had some really torrential rain accompanied by exceptional winds last week and if this leak was a one off, or perhaps that there was some dirt or debris on the seals which was the problem, lets wait and see.