I have a lot of duplicate tools and just overall too many so I'm going through everything and parting ways with things I don't need. I bought a 30mm deep socket for some Disco project in the past and try to remember why... is there something obvious I'm forgetting about that takes a 30mm deep socket?

 

Figured it out - transfer case flange nut.

 

I use a 30MM open end wrench for the D1 rear upper ball joint nut which is is a pretty tight spot.