Never bolted the box down, just the strap. I would be worried that the bolts would cause the box to crack. You would have to have an all out crash to unseat the battery box from the frame even without a strap. I worry about loosing the lid, not the battery box itself.
2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6