Hi Lionel,
I know exactly what you mean

I had that especially unwanted feeling when the trailer went upwards. It has an amount of structural corrosion and all I could see was it sagging and bending like a sling if soft steel reo or one of those lolly snakes the kids like

. But fortunately it didn't. Your REO truck would have had a great deal more weight behind it - the tension must have been awkward to say the least.
Regards,