Yeah, a really dangerous design. There initially were no mechanical stops to keep the individual wheels from pivoting under the vehicle. This resulted and snap rolls with no warning other than the ground hitting your helmet.
An example of well-meaning engineers with no understanding of the operational requirements and realities of a system. As usual, the military doesnt do a good job of operational requirements definition.
I speak as a retired Army Officer and retired Systems Architect.
They started putting roll-cages on the M151 in the 1980s, but it took a while to get around. My last M151 was our survey jeep because there weren’t mounting kits for the HMMWVs for the survey gyro.
They installed the roll cage on my survey jeep three weeks before they took it away and replaced it with a HMMWV with the correct mount.