As a house rule, I think equipment units should be allowed to move more than a single hex when they are towed ; i.e. the fresh unit it is attached to is a squad being transported (truck, half-track, bren carrier...) - they follow the transport vehicule (and thus count against stacking limit).
Off the top of my head, the transported squad should then be fatigued to untow and deploy the equipment.
Do any of you have tried a similar house rule ? What do you think ?