Took the same approach as you, tried the training campaign first and got my arse handed to me rather quickly, so thought I'd try some quick missions. Managed to get a total victory on Direction Found, quite liked how simple it was and had some echoes of Team Yankee to it... a nice toe dipper.
Coming back to 2 Fahrbahns though – I'm about 10/15 minutes in. M60s in hull down positions on the slopes, so far we've picked off quite a few T72 that are making their way across the plains and I've only lost one of the M60 to a penetrating round right through the gun so basically combat ineffective now. Thought I would try pushing up 2 squads in the M113 to the north woods with the hopes of being able to stick a few LAW in the sides of anything down there. Other 2 squads with the dragon are holding up in the forward buildings, but as you say nothing to shoot at so wondering if that was best placement for them.
Coming from the WWII titles and this being my first 'modern' title I'm not too clued up on how to make best use of mech. inf. especially in a defence situation so will be interesting to see if this was a bad move on my part