Ride for Alexander?

• Ride that's transparent and bulletproof
• The first one was a modified Ford D-Series truck
• Holy roller?
• Vehicle where one after mass transported by people in a ferment
• Widely used term declared "undignified" by John Paul II
• Vehicle with a glass case
• St. Peter's Square wheels
• Mass transportation?

Wiktionary Word definitions in Wiktionary
n. (alternative form of Popemobile English)