Hank ran out of Gas, he was so focused on getting away he didn't pay attention, now he was stuck on the side of the road with his RV. He went inside of it and made sure the shotgun was loaded, he didn't think he was followed but he entered in on something big, their was a chance, he could't risk it. 

The battery in the RV could run the lights and electrical wires for a few minutes on full blast, after that the battery would be dead and he would be trapped inside his moving fort. He was out of dead mans blood, he had 4 silver bullets in his revolver in the glove box, he had few explosives left, then he had his two blades, his machete, and his hatchet. He would wait tonight, then leave in the morning. Day walkers were still a threat but he would rather fight vampires in the day then the night.

Hank sat in the driver seat with just the emergency lights blinking, this at least gave him some light with out draining his battery.