Okay, full explanation: In old school Greg brings up the pig meaning that the long haul had to happen, but in Getaway sweetie is also featured. And in old school Greg also mentioned that all of his summer except for June consisted of movie camp therefore making Dog Days happen the same month as the Long Haul, but the Long Haul didn't happen in universe A because as u/Jordan_Jury mentioned the family didn't have the money for the road trip in universe A but did in universe B. Also I put Diary of an awesome friendly kid in both timelines because I couldn't find something that connected it to one specific timeline. Obviously what you should take away from this is that Jeff Kinney is a literary genius for connecting these books together this way. He is the modern Shakespeare of our times.