Supermarket Trundlers Having worked at two supermarkets before, I was very lucky my second shop owner was the first in the city (probably country) to have all four wheels pivoting. When we opened the new shop with them, I received a few irate customers complaining it is silly and don't understand why.
Modern shops have a concrete barrier at one of the two entrances (especially when they faces South) to alleviate the wind and ram raids, but this hinders the line of trolleys going into the trolley bay. The all wheels pivoting trundlers have immense advantage in negotiating those corners.
As a customer, I find it tricky to shift a trolley sideways with non-pivoting rear axle when there is a blockage in front of you in the aisle. I basically have to lift the rear axle off the ground to enable a sharp sideways shift.
Or as a staff member, you have to lift the rear axle up to make changes to direction of travel, putting strains on many muscles.
I have seen electric trundler pushers in Coles, but not here, unless they are attached to a golf cart or on a trailer. I don't think the trolley maker Wanzl makes them for supermarket trolleys, but they do for Airport carts. It works by scooping the carts up.