pack mules

[PlasmaKrab]

Also, big difference is in the mobility. IIRC all hooved units have the same move factor as infantry, so they are much better at dealing with slopes, rough and indeed buildings than regular trucks. Particularly the early road-only sort.
So if you're playing in the 50s on a horrible backwater map with cliffs and swamps and forest, and you have to choose between old trucks and older mules, think it over before dismissing the medieval solution.

[redcoat2]

Sometimes it is good to go medieval.

Italian Alpini delivering aid to a mountain village in A-stan with rented mules:

http://i29.tinypic.com/35baxs7.jpg

Indian Army mules in the mountainous country near the Chinese border:

http://i227.photobucket.com/albums/d...o/dc1ec073.jpg

Mule = four legged all-terrain vehicle.