If it's what I think you're talking about then it's not really an exploit, but it's just using the mobile cover to glitch into areas (similar to the Police Academy farm) out of map then walk to the DZ. It's also not that efficient compared to running around with a hack or CE in the DZ.
I'm not making anything "known" either this is an issue that everyone knows about concerning the mobile cover ability.
Can't post links, but just paste that after the youtube URL - /watch?v=p93p5DYMeaE