I’ve toured Lane’s Museum and it’s a beautiful place to spend a few relaxed hours. Thank you to Jeff Lane, but why in the name of corn-on-the-cob was Smith pushing this museum piece as hard as he did? Non-destructive testing is now considered en vogue. It is embarrassing on many levels and the car looks terrible. I’ve seen it in person.
This is a well known trait of swing axle rear suspensions. My '68 Triumph GT6 had this rear suspension, and when auto-crossed the rear would rise as it was jacking. For normal driving through corners, the lateral force on the outside tire was balanced by almost the same force on the inside wheel. No jacking until the inside tire was unloading enough to no longer balance the lateral force on the outside one. The Brits later came up with a fix for these swing axle cars that included a pivot at the center of the transverse leaf spring, increased rear track width, and more negative camber. The result was no weight transfer at the rear tires, and no jacking. A friend with this rear "swing spring" did not like the increased negative camber, and traded with me. I warned him of this jacking effect, but he insisted and later rolled his car, just like your Tatra did.