Looks like a great riide!!
I just got back from almost the same route you are planning to TDF. We started in Bolivia. PM me for any suggestions you may be looking for. Are you renting bikes in Santiago? Do the Caraterra Austral...much more scenic than Ruta 40. As said watch the wind...it blew two out of four of us off the road.
You'll have an awesome trip!!
14' R1200GSW- 93' R100GS/PD- F650GS- 94' R11RS
08' WR250R- 95 R100R- K75s- 57' R69
77' R75/7- 06' Ducati S4R Monster- 74' XL 250