Add shopping cart to the back of a small car instead of the trunk.
YOU drive to the store.
YOU grab your trolley/shopping cart off the back of your car.
YOU shop. Checkout. No need to bag anything.
YOU put cart on back of car (by ramp or robot arm or... )
YOU Drive home. Push cart into
kitchen. Put it all away. Put cart back on car ready for next trip.
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Since it is your cart, you can add radio, computer, safe, pockets, flowers to cart as you wish.
Also People who shop for other's professionally, might find it useful and good advertising.
3/26 Addendum
a. Shopping carts could be made to fold flat. They already make them nest. Could go in some existing car trunks. They could be the thin end of the wedge of letting foreign carts into various stores
b. A kids push toy with cart and car would be good start as far as working out a design.
c. A kids toy with the small electric cars kids now have would be a second place to proof the design.
d. A brochure with pretty shopper and cart photo shopped onto a dozen existing cars would help sell the idea.
e. Three wheeled motorcycles with carts would never sell.
Well certainly not to Hell's Angels.
f. A old Greyhound bus with ten carts attached below could stop at 10 malls or large stores, dropping 20 club members and then round up the same club of shopaholics. Twenty stores in 6 hours on a Saturday. Whew!