Gold and sliver is real money - for times of pending doom. I know someone who traded $3.000 worth of sliver for a $4.000 caravan, both buyer and seller happy and done deal.
Supply and demand of the actual coins or bars themselves dictates the given value from what I have seen. They can be traded for any thing. When money becomes worthless or worst digital then metals will be the only thing left.
Imagine someone fortunate paying for a house with gold. No stamp duties, taxes or council rates. Out of jurisdiction, virtually in Fee Simple.
You know, for many poor people a caravan is their house, so it is possible. They simply rent someones driveway space, park up and live on. We had a guy living in his van in our work car park for months. He would leave in early morning, go to the gym, exercise, shower up and be back at work parked up ready to commence duty before anyone else had got there. There was an outdoor tap so no water rates for him and no transport costs either. He was his own self contained unit.