While Marge takes the children on a leisurely Sunday afternoon drive (that the kids don't enjoy), Homer is forced to clean the garage at home. He gets spiders in his throat, and his neck is almost crushed by the garage door. When his family gets home, a suffocated Homer is saved by CPR by Lisa and Bart. After the incident, Marge insists that the family buy life insurance, but Homer is deemed uninsurable because of his bad medical history; even boasting that he smokes, to impress the consultant, which predictably does not work. Marge decides to save money in a very paranoid way by buying imitation brands of cereal and coffee, and convinces Maggie to conserve her pacifier. Homer, however, becomes upset with Marge's petty attitude (especially when she will not let him spend even false money to buy a single beer) and tries to argue with Marge, remarking that he has the right to use at least a part of the money since he brings it home, but she denies his request, retorting that he does nothing in his job. Homer, now angry about Marge's new measures, takes the money she has saved and makes a down payment on a new motor home. After he buys his motor home, Marge tells Homer to enjoy it because she is not speaking to him.
Homer starts living in the RV, and he and Marge compete for the loyalty of Bart and Lisa. Fortunately (for Homer), his childlike ways give him an advantage. Homer discovers a convoy of RVs at a gas station, and he invites them to stay in his backyard. Marge, annoyed with their behavior, cuts off their electricity, causing Homer's newfound friends to ditch him. Homer and Marge proceed to get into an all night argument, to the point of Homer calling Marge's bed "a loveless slab of bossiness", and fearing that his parents could split up, Bart decides that he and Lisa should return the RV to the dealership for a full refund, and Lisa agrees.
Discovering that the children and RV are gone, Homer and Marge give chase in the car. Bart and Lisa accidentally get on the freeway and force their parents to kiss before they will pull over. But after they kiss, Bart asks Homer to raise his allowance, which causes Homer to strangle Bart. Lisa starts to lose control of the RV, which plunges off an uncompleted runaway truck ramp onto a Turkish container ship. The ship is leaving port, but Marge convinces the captain to turn around after offering him 300 cans of mushroom soup she bought on sale. With their marriage restored, Homer tells Marge that he will return the RV in the morning for the refund, and uses the ship's crane to put the vehicle on a nearby pier. Unfortunately, the RV's weight is too much for the pier to handle and it collapses, and the RV sinks in the harbor, much to Homer's dismay, while Marge is unconcerned about the loss of money, because the Turkish sailors put hashish in her food, just to loosen her up.