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.
The roll cage was a good idea. Stiffened up, a flexible mount for guns, or a rest for a light, anti-tank weapon.
The problem remains that the scouts haven’t had a good replacement for the 1/4 ton. The Army remans stuck on stupid thinking that bigger is better. They need to apply what is really needed to the mission of the operator.