Front windows leaking whilst driving

We had the same type of problem with our c/van when towing only ,

We round it was coming in under the window as the rubber seal had a small "gap" where there was a joint at the bottom of seal

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I used to have exactly the same problem with my 2009 Ranger Series 6.  The seals on all the front windows had their join in in the bottom centre and this allowed a minute bit of rain to be forced through when driving.  Cured by getting a small rubber insert that fitted inside the seal and some black sealant.  My local caravan repair man did this for very little. You need to get this sorted soonest.

Thanks for all the comments i have the van at home at the moment so intend to look at this with all your comments over the coming days before i take it back to the storage site.