Yeah but what if its a really big map? In real life how far away did they drop them off from the battlefield? Was it a few miles or could it have been closer? I understand that they didn't spearhead assaults but some maps can be huge, and some of them were designed for light combat and reconaissance.
You don't fight over huge areas with single squads of men. If you've only got a small unit, you don't break it up too much. You keep your forces concentrated, because if you spread out and the enemy doesn't, then he uses his concentrated force to individually crush your dispersed small groups. It's called defeat in detail, and it sucks.
As far as transport to the front ... with a truck, you're not going to go right up to where the fighting is. Your transport elements are just as valuable as - if not moreso than - your combat troops, because they provide your logistics support. You can't get food, bullets and replacement troops to the fight if you're putting your trucks in harms way and losing trucks to enemy fire unnecessarily.
In some areas you're not going to have any real choice. Artillery, for instance, will be pulled by a truck.
Half-tracks are combat vehicles, yes. They do belong on a battlefield, but they're still not generally going to be employed like cavalry, jumping around the battlefield.
Here's a good source of information on the employment of half-tracks in WWII.
