Which trickle charger should I purchase?

Bought the ctek mxs5.0,  I went to remove battery to charge at home, then realised that when my wife told me it was flat with no voltage that she hadn't flicked the switch from car to van! ...

You can't get the staff these days!

As a slight alternative, have you considered getting a solar panel fitted to the caravan? Assuming you aren't storing your caravan inside, this would keep the battery topped up, mean that you don't have to take it out to charge, and also mean you can more easily venture places without EHU!

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Our van was manufactured with a 20W roof mounted solar panel. Later models have bigger ones. The panel is enough to keep the battery charged in storage and allows us to use our motor mover. When staying off EHU we supplement the panel with another 90W suitcase style panel which allows indefinite stays. I don't think we'd enjoy disconnecting/ reconnecting and lugging batteries around between trips.