運搬 and 配送: general movement of goods and shipment to a recipient
Compare general transport with shipping to a receiving place. Distance or vehicle type alone does not make the terms mutually exclusive.
General movement of goods
運搬, read うんぱん, means transport. 荷物の運搬に台車を使った。 says that a handcart was used for transporting the luggage.
The tool used to move the goods is supplied. Transport can also describe moving furniture inside a room without making it an ordered-goods shipment.
Shipping to a receiving place
配送, read はいそう, concerns shipping goods to the receiving place in this comparison. 注文した机は週末に配送される。 says that the ordered desk will be delivered over the weekend.
Read the context of sending the ordered item to its recipient. Shipment also moves goods, so it can overlap with the broader transport description.
The vehicle does not decide the focus
班で木材を倉庫へ運搬した。 says that a group transported lumber to the warehouse. The object and destination specify the movement.
Do not set a fixed rule of short-distance 運搬 and long-distance 配送. Read general movement versus shipment to a receiving place instead of choosing only from the vehicle.
Can 運搬 and 配送 always be distinguished by distance or vehicle type alone?
Show the answer and why
No. Their focuses concern general goods movement and shipment to a receiving place, with overlap in one transport event.