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I haven't play OH since a while I have to admit except 1 or 2 2v2s but I feel you. Problems became to arise since lowering of PAK40 ROF. There are many inconvenients:
- To have an efficient AT defense early game, you need 2 PAKs if you don't upgrade to shrecks.
- To help your fragile grens you will need mortar/mg support.
- To have all above means you are already cornered.
From my middling player experience I can only say that what I prefer for early game at list as the best AT solution OH can field, are shreck PZgrens. I know, the investment means alot but it worth saving amo for it, this is somewhat proven at my level. The idea is how to resist without spending money for lmgs, mines even flamers for pios until then, that is a tricky one. For 1v1 building caches is not realy an option except you have an opponent who let you breath from time to time; for 2v2s the first cache for OH will be amo, not fuel and I allways have 2 PZgren unit.
For me and my micro level, they have advantages than no other AT or light AT solution has:
1. They can't be flanked;
2. They can't be decrewed;
3. They can be withdrawn and refit and make it through the game until the end of it in many cases;
4. They don't cost fuel;
The only thing you have to pay attention to, is not to lose the squad / squads. It happens some times to me, but I am not that good at unit preservation especialy in OH's case.
Hope that helped...
but this time he's right. 
_Hiena_
xingyuguan
Relic Entertainment
