I just got an E350 15 seater. I'm going to take out most of the bench seats and just leave the first row in. I was thinking of bringing the 4th row 4 seater forward into the 1st row location. It looks like the legs are spaced differently though.
Has anyone tried this and how hard is it to relocate the mounting bracket?
Thanks.

 

I pulled my 1st, 3rd and 4th seats. The occasional rear passengers had much greater ease of access and plenty of room for their feet/purses/computers ... and it worked better for the dogs.

 

Crawl around under the van and look how the factory mounting pockets are installed at time of the build. You'd want to replicate that in order to have any passengers riding there be protected and secure in case of a collision.

 

Not sure about the bracket configuration on yours, but on mine the 4 passenger seat and the 3 passenger seat had different spacing. I had to mark for the new bracket location and drill new holes. After you drill the holes I would look at their location to determine the type of reinforcement, if any, is needed. I then used large washers, lock-nuts and anti-seize to secure the brackets.

Just make sure you are not drilling into anything important under the van and have access to the bolt.