Call us crazy, but we could not resist the temptation to test exactly how strong our SpiritCups are, so we talked to our local dealer, Neuwirth Motors, into letting us put a Jeep on them! The next thing we knew, a 2012 4-door Jeep Wrangler Arctic, weighing 3,771 pounds was lowered onto our SpiritCups.  Not surprisingly, to us, the cups held without a single crack.