In your original post you mentioned the ARB. I have looked at that as well. I even wrote to ARB and they said it should not be mounted under the vehicle.
Now, in the real world… UJoint OffRoad sells a bracket to mount it under the chassis and as a whole kit. My guess is that it might eventally fail.
www.ujointoffroad.com
I have settled on the Viair because it has similar specs, is smaller and cheaper. But I’m not acquiring all my parts yet and I’m watching this thread.
Now, in the real world… UJoint OffRoad sells a bracket to mount it under the chassis and as a whole kit. My guess is that it might eventally fail.
Onboard Air System | Ujoint Offroad

I have settled on the Viair because it has similar specs, is smaller and cheaper. But I’m not acquiring all my parts yet and I’m watching this thread.