That accident sway video ... question

My brother and I used to race dirt track modified open wheel cars. On a not so good night, the front suspension got ripped off and the tow truck backed the car onto our open trailer. We left the track towing, not thinking much about it until a car blew past me at about 20 mph faster than I was going. The trailer really started to dance. Fortunately I got it under control and we continued much more carefully. It had never occurred to us that since the car was loaded backwards, the engine was now behind the trailer axles instead of in front. Tongue weight makes all the difference.