We have 100 AmpHour AMG battery in van. Can it safely be ground to a seat belt attachment point in the frame of the van? The seat belt attachment is definitely reinforced metal on the passenger side by the barn doors of a Chevy Express. It would save us drilling through bottom of van and finding a point on the chassis. We will only be running some LED lights, MaxAir fan, and some USB chargers. Appreciate any advice.