I would take either LSD, or an open diff rear end. For some reason, I cant even find any examples of Mitsubishi L300 DRW axles online.
My SRW axle at the moment has LSD, and I enjoy it much. It would definitely be worth it for me to find a LSD DRW axle.

For some reason, I feel like I will have to build a bed from scratch. Especially since I dont even know the complete width of the DRW axle.
Let me know if anyone has anyone info that might help my search??