Wow !
years ago, I owned a 22' roll deck car hauler. Locally, I did not carry a spare tire, but on long trips I would carry one up on the deck. Usually, chained up front to the front bulkhead.
One time, I dunno, guess I was in a hurry, so I flipped it up on the rear of the empty deck, ran a chain over the top with a chain binder holding it down...good to go.
About 100 miles from home, for some reason my eye was watching the mirror when the tire, a 22.5 truck tire, fell off the back at 70 MPH and bounced about 50 feet in the air !
Thank God no one was behind me or I might have killed em.
Hindsight and logic, the rear end of an empty deck bounces a lot more than the front.
Lucky that day!