Codex: The Galactic Empire (WH40K House Rules)

[Ryan Thunder]

It probably would be considered "heavily armoured" yes

Relative to what? And for that matter, based on what?

"Heavily armoured for a 40K vehicle.", and "Connor's statement.", respectively.

[Connor MacLeod]

list of probable imperial vehicles.

As for durability, alot of the "heavy" repulsortanks are a good fraction of an AT-AT's Mass/volume, but without the troop carrying capability, so I'd guess they'd have broadly similar durability (to within an order of magnitude). And almost ecertainly comaprable to a Juggernaut.