The four wheels on the ground, low fixed platform, arches for handles and support at both ends, is often the form preferred by delivery companies bringing stuff

The four wheels on the ground, low fixed platform, arches for handles and support at both ends, is often the form preferred by delivery companies bringing stuff into buildings with big enough elevators. I think what you call sacktrolley is typically known in the US as a hand truck? That form limits the number of packages that fit too much for larger office buildings, and is mostly used for residential delivery, needing to cross less even driveways, curbs, etc.