1. It is necessary to measure the space of the tricycle to ensure that the stall shelves can be put into the tricycle after being reduced. According to the measurement results, some parts of the stall shelves can be reduced and adjusted. For example, reduce the size of the rack, drawer or display board.

2. On the premise of keeping the function unchanged, the structure of the stall shelf can be redesigned to make it more compact. For example, the folding design is changed to a detachable design, so that it can be quickly disassembled when necessary.