explain demo units-goliaths and bogwards

[raizer]

Ive used these in other games...
but how do they work in the pzc games-particularly with VMs alt values? and what is the best way to use them?
I guess you move them up to fortificaitons and assault with them along with other units? im looking at those old die hards from the 78th sturm-the guys who stood tall-and see them with a few goliaths in Kursk and wondered how you guys use the little go carts effectively.