Or when the F-4 Phantoms and Skyraiders started Strafing!, -I think they'd Sure Pretty Quickly Drop their Load!

A Cart would certainly be Better, -if all one is doing is Walking a Wheeled Vehicle!

So they often used Bycycles simply because they had a lot of them! And a comparatively Simple, Cheap Vehicle, besides.

But then too so are Carts, -All of the Above! Knowing the North Viets and such like I do, -I can only suppose that they used a lot of Both.
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"No Substitute for Victory!"and"You Can't be a Beacon if your Light Don't Shine!"-Gen. Douglass MacArthur and Donna Fargo.