Ours is on the door side as well and we've never had an issue. We typically fill at one of the spouts in our campground loop, so it's been a non-issue. And we've been to a different campground each time we've camped the 2 summers we've had our TT. If we have to fill at the dump station, the majority of places we've been at have the fresh water on either side and away from the sewer parts. I get grossed out filling at the dump station though so we rarely fill there.