What did Randy and Lib decide to do? Why?

Randy and Lib go back to the Admiral's to brainstorm ways to deal with the highwaymen. Lib comes up with the idea to go to Rita Hernandez, who has gas and a supermarket delivery truck. It would entice the highwaymen, who would then come close enough for Randy and the other men to kill them. Rita agrees to his plan, and they stage a scene that makes it look like he stole the truck from her, and he takes it back to River Road.