There seems to be a minitrend in middle grade literature involving living in a van or camper; Svetcov's Parked and Nielsen's No Fixed Address have families living in vans because they are homeless, Gemeinhart's Coyote Sunrise has a similar plot about driving away from one's problems, and Nelson's upcoming (September 2020) Alpaca My Bags also has a family living in a camper. The details about finding a place to park, sleeping in hammocks, and using rest stop restroom facilities will appeal to readers who want some travel and adventure.
Road trip books are always interesting, and Claire's father drives VanHelsing through some interesting places; although they don't go to the Rock and Roll Hall of Fame, they pass it, and almost go to an amusement park along Lake Erie, probably Cedar Point. They meet a lot of other people who are camping, including a boy Claire's age who turns out not to be very nice.
Families splinter for all sorts of reasons; it's not always because a parent has passed away. Children often are not told about economic difficulties that families are facing, but are aware of them nonetheless. Books like Wrong Way Summer help build empathy for classmates who might be in difficult circumstances while also providing vicarious travel experiences.