Seeing that the VX is a full frame truck fabing something up wouldn't be that hard so long as the design was sound. IMHO this would be really cool and totally add to the VX's character. I mean how many PUV's are out there and how many are off-road capable and how many are set up that way.
You pretty much answered your own question there. The preeminent competitive offroad vehicles don't run rear independent suspensions. The reason being that the front sucks up most of the "whoops" while the rear provides most of the "power push". What that means for the uninformed is that the front suspension(IFS in the case in point) deals with most of the travel and "normalizes" it by the time rear hits the dip/rise, therefore mitigating the overall effect and allowing the rear to "see" less of the travel. The rear in this case is used to transmit power to the ground vs. the somewhat "weak" IFS front. I know there were a lot of "" "" in the previous sentences, but if you do your homework, you will have a better idea of the logic behind what I'm saying. Rear IFS really only has it's place in terrain where there is no little to no shock loading and only a medium amount of articulation. Anything more and the rear end will get grenaded by the forces it encounters. Most are unwilling to gamble this way and use the rear solid axle as a way to hedge their bets against unforeseen obstacles.This is only one of many reasons that Baja trucks run relatively "mild" tread patterns-so they don't impart destructive forces on the rear gearsets-such that would destroy a rear independent suspension. Rear IFS should stick to mall crawling Honda CRV's until steel becomes so irrelevant as the automakers choosing to use titanium drivelines.