The organization uses a company to ship the bike to/from Argentina. You can sell it if you want, the bikes in Argentina are more expensive than in the US.
I think that the best choice is to rent a vehicle, so that your team can make it to the vivac and move freely.It's not a long race.. you are not going to need to much spare , tyres,etc.
who will carry spares? Malle moto style?
I think so.
I can upload pictures of '11 Ruta 40 that I took when I was in the Vivac.