At long last, I have been gifted with the ultimate solution to killing the formidable Maus (or any Superheavy, really):
Step 1. immobilize it by lifting it into the air with a Hetzer
Step 2. get an M3 Lee and a Tiger(p) to distract it so it turns it's turret.
Step 3. Drive a Type 89 onto the Maus using the Hetzer as a ramp, and jam the Maus's turret.
Step 4. Get a pz 4 on a hill to shoot the engine.
Step 5. Profit.
You can all thank me later