Regarding climbing Aconcagua -
I summitted Aconcagua in Feb of 2011 - I traversed the mountain starting from the Vacas Valley and descending the Normal Route. (Horcones Valley) I traveled alone, carrying my own gear but did end up using the services of the "porters" who will take extra gear down the mountain for you, at a per kilo price. To say I "soloed" the mountain would not be a true statement even if I camped alone as there were several commercial expeditions that traveled the same route.
As one person mentioned, this mountain is often understated and should not be taken for granted. While I was on the mountain in Feb of 2011, several major snow storms hit the mountain, making travel and the temps a bit more challenging. Three people lost their lives during this storm period for either pushing it too far (To beat the storm) or altitude - most likely both.
I've climbed throughout the world and am quite new to the Overlanding community, to me, combining both climbing/exploring with the Overlanding experience is a great way to see and travel the world.
Stay safe
tvoverlander