..I'm assuming he's looking for a high-current c12V power supply for reasons other than powering caravan habitation electrics, and wondering whether that market might be a cheap second-hand source of one.
As I've posted above, the general provision for caravans/motorhomes isn't really playing in the space much above 18A-20A (and the voltage range varies somewhat, slightly above the nominal 12V).
A reasonable quality "caravan" charger/power supply up to, say, 20A can be obtained for something around £200 new, above that, the price rises steeply for increasing amperage.
(The biggest demand on an installed unit is likely to be for charging a somewhat depleted battery, not powering low-power domestic consumers).
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