The trouble is that since super-heavy tanks are very likely to be dummies (utterly impractical, difficult to produce) it might be better to mainly make dummies of main battle tanks or medium tanks. Those could be deployed in believably-large numbers in order to force the enemy to divert their strength to counter them. Dummy artillery positions obviously have a long history, but lighter dummy weapons could also be useful. Dummy MANPADs, dummy AT weapons, dummy RPGs. Dummy soldiers with dummy rifles, conscripts or penal infantry wearing faux-elite gear. Of course it would become clear to the enemy that this is all just smoke and mirrors when the dummy weapons don't fire, but if they were mixed in with real equipment this would leave the enemy unable to tell the difference right up to the point of contact.