The tray is built to hold the same Gr.65 battery as the original under the hood, and it's relatively easy to unclamp & remove from below the truck (if you know it's there, and how the clamp works).
I broke the plastic cover off during installation, but this is a common GM stud, so I'll be able to find another easily. Later, I'll add the OBA & power inverter wiring at this stud.