Possibly something from Iran like the SPG-9? A conventional RPG-7 is incapable of knocking out the Merkava tank. Parchin Missile Industries in Iran however manufactures a tandem heat warhead version of the RPG-7 which is able to stop a Merkava.
A regular RPG of Viet Nam era can make your ears ring for months. I would hate to be in a confined space when it went off.
Parchin sounds like a good target to me - one Cruise Missle down the stack and one through the front door.
Possibly something from Iran like the SPG-9?