What tent for South America?

[pingvin]

Going motorcycling for 2 months in South-America starting New year. Will start in Santiago, go up to Bolivia and Peru, cross Andes a few times, surely will spend some time in Argentina and maybe Brazil, and, if time allows, go South of Santiago a bit as well.

Plan is mainly staying at hotels and B&B but will bring basic camping equipment, just tent, sleeping bag and Therm-a-rest, in case of emergency or if we just want to camp for a night.

Not very familiar with camping, what tent should I choose? 3 or 4 season? Single or double layer? If inner tent, mosquito or "solid" walls? Do I need a base as well?

Guess I risk experiencing both cold nights in Andes and hot/humid jungle.

Want a light tent, prefferably under 2kg (4lb) but less is even better. And think we will have 1 tent each but og for 1-2 or 2 person tent so not to cramped.

Want good quality and willing to pay for it (within reason) but bonus if not too expensive