u/usernameS4

Looking for a good spot to ground my house battery in the rear of the van. I'm considering sanding off the paint here and adding a grounding post but wanted to see if there's a better option.

Getting ready to order upholstery for the van and I'm thinking of going with a charcoal or graphite colored carpet on the panels below the belt line and tweed above it but looking for some real world feedback. Is the tweed durable enough that I could use it on the slider and under the crew window and just use the carpet in the lower section of the back?