No, we didn't use the extensions. The tracks would back up to each other, then we'd just put up the GP medium with all the tracks, with ramps down and horizontal (they sat on a 5 gal fuel can for stability). Walls of the GPM would be left up, or pulled to the side, so the tracks could back up to each other and be covered in the rain.
The back of the S-3 577, which I remember best, was pretty packed, well, about half full on the floor. We *never* did anything from within the 577s, they were just to haul crap. If the S3 or CO wanted to do some planning, they'd do so outside their HMMWV, or in the back of their M2 (I'd presume an army heavy bn would just use their HMMWV).
On that note, some commanders stayed in their HMMWVs exclusively, and their M2 would just sit outside the TOC (or near the support battalion TOC/maintenance areas). Actually, while I'm sure some commanders spend their time in the M2, I really can't recall ever seeing that. Maybe in war, but sure as heck not in training. The HMMWV was easier to communicate with the battalion in, faster, easier to get in/out of, lower profile and easier to hide, better range, and so forth.
I don't believe the modular system was an option back then. I did plenty of inventory, and don't remember any other tent systems. It may be one of those things created that the guys in the units just never liked, so never issued it out.
In hindsight, I don't think America knows how to fight without dominating the environment. The only wars we've fought with vehicles we've done so. One could argue vietnam we didn't dominate, but our kill ratio would beg to differ. In a war where that TOC needs the mobility as we had to fall back a lot, it wouldn't have survived very long. Perhaps the Soviets had some good ideas in that they didn't have those quick up-front TOCs commanding battalions, as they were too hard to defend in large engagements. The Russians did fight for years against an enemy that dominated them in most ways. That experience vs ours may be the reason why the Soviet's don't have the lower level command structure. I dunno, hindsight and all.
Really wish I would have taken more pictures while I was in
