In Winter maps I find at least 1 Ski support rifle coy to be useful
It would be nice to change core grunts for ski - sometimes I do that in winter time. (Thought to self, a "change all of this type to X for this platoon/coy/all such" might be handy in the upgrade screen! - clicking 20-30 items gets old
)
Usually I point the support ski coy at a subsidiary objective cluster with a couple of support AFV in attendance, say T-60 or zis-57mm. Rest of force concentrates on the other 2 objectives. Core usually goes for the ones approachable via a road if possible in winter. Usually have enough tanks with section-sized lift to carry a company as riders in the core. If only BT, then I pack some scouts and/or 14.5 ATR teams as initial security elements.
122mm guns crater roads - so I use them in the early battle to smash his road approach routes (1 or 2 guns work each approach road), and to draw counter-battery fires, then smack any revealed on-map with my 120mm mortars which have remained silent till on-map arty is revealed.
Andy