while true, the only way to achieve this is thickness and angles, as witnessed by how the hmmwv armor packages are applied via FRAG levels “confusing in its own Right”. there are no slopes on a hmmwv for the most part, the perimeter armor is both ballistic grade and aluminum, laid on as part of FRAG packages, early armor is “composite armor” no longer used. Anyone can weld steel on a truck, most ammunition encountered will be pistol calibers, that’s easy to defeat, rifle calibers too stateside due to all FMJ and not AP….now, once you encounter a true AP round? Well….that’s where all bets are off.