Years ago, Moishas and KRM tried the leave 1 bag of groceries as a deposit fo the wagon and then come back for the bag when returning the cart.
I am not sure if what I am about to write is halachically correct but my sevara is that once you pay for your groceries and take the cart to your car you become a shoel (borrower) and are responsible for any damage or loss except “meisa machmas melachah” (I.e. wheel falling off the cart).