Thought I should share my current 2v2 Build Orders:
Kubel
Volk
Volk
Medic HQ
Retreat Point(If needed)
Volk
Raketenwerfer(Can be built slightly later if not expecting any fast armor)
Flak HQ
Ober
Luchs(Depends on spammed enemy infantry, I will not build it if I go for Panzerfusiliers)
Ober
Panther
Mech HQ
Then whatever I feel I need for the match.
Interjected in their might be MG34s, Panzerfusiliers depending on map and what my opponent produces (you should always be flexible, which I find some people have a hard time of). I will get a Walking Stuka only if I find the enemy blobbing support weapons. King Tiger only comes out if I have the fuel and the enemy is spamming armor really late game.
I used to go Mech HQ into Puma, but I find going Medic HQ into Flak HQ then getting quick Luchs works almost better, due to the Luchs being able to take on light vehicles and infantry really well. It doesn't scale as well into late game, but I find not building Mech HQ removes the temptation of converting munis into fuel too early. Unfortunately, I rarely can afford mines anymore since the lowering of munis to 80%. :/
I rarely build the Jagdtiger, Flak HT, Jagdpanzer IV, or Ieg support gun; they just seem mediocre or very micro intensive and I already go heavy infantry build so I shouldn't add fuel to the fire.
the retreat point isnt really necessary until the mid game. with a forward medic truck you can just walk back. you have to overextend to make walking back dangerous. also its better to make your medic truck after the 2nd unit you purchase, because at that point there is not enough enemy units on the field to kill it. since youre saving 300 mp you can purchase another unit.
flak hq needs to go up at exactly 80 fuel, as fast as possible. this means getting it around 7 minute mark. do the math to make sure youll have 200 manpower when you have 80 fuel and make sure the truck is already in a spot you want to place it.
also converting munitions to fuel is never a good idea unless you have both munition points, or no longer need munitions for shreks/offmaps/mines. the amount of munitions income you lose compared to the fuel you gain is pretty disproportional. Flak HT is a regular purchase for me in the late game vs Airborne since you shoot down p47s down extremely effectively.