I had an Aero tank in my CJ. It hung way too low, and I was always banging it on rocks. I also had a hard time keeping the electric fuel pump o-ring sealed, the lock ring just wasn't a great design, IMO.
I pulled the Aero, and went to a TrailQuest tank ( http://www.trailquest.com/tanks.shtml ). Since I have a 1" body lift, I requested that they lower the mounts 1" on my tank, so it sits 1" higher. Since I have Howell EFI, they also built it to accept a factory GM fuel pump. It's baffled, and has a really beefy skid welded on. It is heavy though, it weighs over 70 LBS empty.
Bob
tufcj