I had that happen with a set of doubles!
Can definitely say the most scared I've ever been in my life!!
I had 55,000 lbs of paper on board. Yes, that's overloaded for a single-axle day cab & a set of pups. That's what you get for being a rookie & trusting your dispatcher. So I'm coming down 190 South in Sterling or Boylston somewhere down a fairly steep hill, and just let the truck go. Could feel the sheer mass of the paper pushing me down the hill with some good force. Before I could hit the brakes to slow down, I hit some bridges that were heaved up due to the repaving job they were doing at the time. I came violently out of the seat, then the whole set started wagging all over the highway. The whole cab started TWISTING from front to back. I had enough sense to not slam on the brakes in panic - I just let off the pedal, & held onto the wheel as best I could for what seemed like an eternity. The wheel was turning in the opposite direction from what the truck seemed to be turning in. When I say twisting, I mean TWISTING! Thought I'd be dead any minute. Seemed like I blacked out for a second, then everything was fine ..... then sweat immediately poured from every part of my body & I could feel my heart POUNDING like never before! WHAT A FRIGGIN' RIDE that was!!
Thought for sure that was it for me. Would've made front page, that's for sure. What a mess that would've been!!! No idea how I even pulled out of that. Had some help from the Good Lord that day - that's for certain!!
Also had it happen to a MUCH lesser extent when I overloaded that enclosed trailer by 4K+ lbs. Got up to 45 mph, and the trailer started wagging all over the road. I had to pull over & let everyone pass me.
First time that ever happened ....
Didn't even bat an eyelash on that one after having lived through the doubles incident. That;s what I get for not having the guy push that last pallet forward over the axle ...