Most towns in Arg have municipal campsites, just ask a local cop, they might even give you an escort there for something to do. People in Arg seem to use them more for BBQs/parties than camping though so most are pretty quiet. Free camping is great and not to be missed, most places in Patagonia you'll be lucky to see another car so I wouldn't worry about getting disturbed too much.
Camping very easy in Arg / Chile but we didn't use the tent again till Costa Rica as camping becomes less of an option further north although you can still do it if you can find somewhere suitable. Accom is pretty cheap so we couldn't be bothered getting the tent out.
Regarding security, we had nothing at all stolen in any of the Americas, Asia was a different matter however!
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