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The Long Haul follows Greg Heffley's disastrous family road trip to attend Meemaw's 90th birthday, where his plan to sneak off to a gaming convention (Player Expo) goes hilariously wrong, leading to gas station chaos, a pig encounter, a fender bender, and a run-in with a scary-looking family ("Beardos"), turning a family bonding experience into an unforgettable, technology-free nightmare filled with misadventures and embarrassing moments for Greg

The Long Haul the movie differs significantly in plot, characters, and tone, with the movie creating a standalone story about a road trip to Meemaw's birthday, adding new characters (Beardos, Mac Digby), changing the ending to a happy reunion with Manny's pig, and featuring a new cast entirely, whereas the book focuses more on Greg's mundane summer and his rivalry with the Beardos during the trip, ending with Greg finding a locker key and dreading his parents' discovery.