The Crew van comes with a three person passenger bench seat behind the driver and co-driver seats. We want to use that room for a living area, so we have to move the seat back.
Luckily, the 2015 crew vans come with captive nuts under the floor in the positions the seats would take in a passenger van. It’s weird — Mercedes puts the nuts in place, but then puts a solid metal floor right over them.
If you know exactly where to drill, it is possible to cut through the top layer of metal and discover the nuts. As it says in this thread on the Sprinter-source forum, each set of nuts is 858mm back from the set in front.
Measure carefully, then drill a small pilot hole to check you’re in the right place. If you get it slightly wrong, you carry on drilling through a thick layer of metal – the edge of the nut. Here’s what that looks like.
We were some of the first people to test out the measurements in the forum post. The first set of measurements that got posted weren’t quite right. We ended up drilling in to the edge of the nut, and then we had to re-measure and drill a second hole in the right location.
If you get it right (858mm per seat position), you drill through a thin layer of metal – the van floor – and then into the center of the bolt hole.
You can use a flashlight to check that you’ve hit the middle of the captive nut that’s welded underneath. Then you just carefully enlarge the hole with a step drill.
We put the seats back to the third passenger row. In a 170″ wheelbase van, that gives us plenty of room for a living area, and *almost* enough room for the bikes behind the seats. Six inches further forward would have been perfect, but we’ll put up with the slight lack of space. Getting the seats mounted in a different position would cost a lot of money and needs someone with good liability insurance.
Some people have created a one-and-a-half position seat by drilling the rear hole of one seat position and the front hole of the seat position behind it. This involves also drilling a new hole in the seat mounting plate. It’s explained fully in the forum post.
You’ll have to cut some holes in the wooden van floor to clear the seat mounts. Here’s how we did it, using the indentations in the rubber floor mat to mark the locations, then tracing the shape of the cut-outs using the existing holes in the front section of the floor.