First of all, you played with an eff'ing newbie. Second of all, I'm pretty sure that he lost the match for you after a few times of brief competency. 
I do have some questions where I'd like people's opinions. With everyone getting CAS lately, I've been playing a lot of Guard Motor since B4's or ML-20's are now hard countered most of the time.
1) I haven't been building the scout car because CAS greatly helps with munitions so the scout car often gets fausted if grenadiers are present. Do other people play this way or do the build the scout car anyway?
2) I usually build 3 penals and 2 guards, then either a sniper or rocket truck. What do most people build for infantry? Do they get any anti-tank guns? What tiers?
3) I often end up floating a lot of manpower and fuel while either at 70 pop cap or waiting for the CP's to be able to bring in the T34's. I'm always hesitant to build something knowing that I'll have to lose it in order to bring in the tanks.
4) I usually save munitions for mark target, and occasionally for button if someone gets too aggressive. Would it be better to just lay mines?
Guards are crap atm. Pure cons is always effective with a couple penals if you need them or T2 for Maxims/AT. It's been a while since I watched that replay, but I'm pretty sure you only spammed guards and floated 1000 MP at one point. Caches man, caches.
Even if Wehr goes CAS, he still needs 3 CP to use the transfer ability. Plus, you can always use the M3 on the OKW side of the map. He will have nothing to stop it especially if you pop a flamer squad in there.
Mines, mines, mines, and demos. In all honesty, it's easier to kill tanks when they can barely move that once they're marked. Demos can easily wipe blobs. Plant them at choke points (i.e river crossings, the center VP, you get the idea).