You can. I think the old KV-1 is now called the KV-2, with the big turret and gun, but that one used to be an absolute beast when it comes to credit farming (I have the S-51 from it, that's how beast it is!). Other than that I mostly use three premium tier 8 vehicles, as they're absolutely beast too, farming millions of credits and about 50k free XP over night.
I always use Arty for farming. Start 20-30 Sek later, using "clever" for fiering. So he mostly start fiering at start, earns good money and has low costs for repair. And the spinningbug does not happen very often caus he starts fiering befor he reaches the buggy waypoint.
I Like the American M6 for cash making. It can hold it's own against a KV-1S if it gets played right (My best game: I was in a platoon with 2 mates they were in KV-1S's. I got 8 kills, they got 3 each), and it makes a fair amount of creds.
My experience from L?we, T34 and Type 59 is that a Type 59 botted is the biggest credit making monster. I think it is the speed that makes it get more credits/hour than the heavy t8 premiums. Anybody experience with KV-5 or SuperPershing?