USF mechanized commander works wonder on 1vs1/2vs2/3vs3/4vs4 vs OKW. Just veto heavy urban maps. Work well vs Ostheer but you need much more micro.
Starting RE rush choke point building. Do not try to cap anything on your way.
1xRE going capping
1xRM wait at the base
1xWC51, load RM and go for a ride: Objective is to kill the Sturmpioner. Use its pushing ability to not let the squad fireback. Do not forget to chase him on retreat. If he doesn't retreat it before losing 2 models you have 80% chance to kill the squad on retreat.
The RE on the building is there to deny it access, at the moment you engage the fight with the WC, you can leave it and assist the kill/cap.
Next, chase the Kubel, its probably capping on the other side of the map. That's an easy kill.
Repair and continue to chase his volks until he decide to field a Raken.
On the mean time, 2xRM + BARs
You should have cap 80% of the map, both fuel points included.
equip BARs,
Use your WC51 on flank only, be careful of the raken. If you keep moving, you have low chances to get hit, just use the WC51 to harass with a RM as spotter.
1xCapt
Captain, use it to speedup your pak Howi building time
Captain to speed up your Stuart building time, exchange WC51 and Stuart crew
Recycle your WC51 (you should be CP2 by then)
This strat leave you with a lot of MP, you shouldn't be losing a lot of models so 90% of the time, I build Pak and Stuart in a raw.
Mid to Late game like you feel it. I usually build a munition cache to be able to spam CP8 arty barrage
You'll probably need a bit of training, do not think the strat doesn't work because you lose your WC51 on your first games, you really need to learn to micro it since the unit doesn't have a incredible pathing.
WC51+RM > double Sturm if you keep pushing them.
WC51+RM > double Volks if you keep pushing them.
Garrisoned squads > WC51+RM in most of cases
Volks at long range > WC51+RM, they are hurting the WC51 pretty badly actually.