1. Structural difference: the box body of a common box-type truck is a closed cuboid structure, while the box body of a winged van has an expandable side, which is used for loading extra-long or special-shaped goods. This structural difference makes it impossible for ordinary box trucks to be directly converted into van trucks with wings.

2. Potential safety hazard: The modified car needs to ensure safety and stability. The box design of ordinary van is relatively simple, while the box of wingspan van adds mechanism and supporting structure, so there are some differences in bearing capacity and stability.