What are some essential items for going mobile?

I’m going to be going on the road full time with my dog. What are some essential items to have in my car. I only have a Pontiac G6 but I will be removing the back seats and possibly the passenger seat. I also looking for suggestions on money earning ideas while I’m traveling. I will be saving up and buying a promaster van but it’s gonna take awhile. Any other suggestions are welcome too.