Looks like this particular popemobile was recently commissioned, and it's large. Built on a dodge ram truck. He planned to donate that from the beginning, though I suspect he expected to be alive when it was converted.
In related news this is the first time a popemobile was used as a hearse, since it's spec'd in a way that allowed that.
I think it's clever. If it still resembles a popemobile after the conversion the image of it destroyed may haunt Isreal. But yes, he ensured it would be feasible.
Insurance doesn't cover acts of God