Thanks for the input, Discomick.
I'm leaning towards making a star plug like Tim's one above for the solar hookup, and using it at the connection between trailer and tow car. Saves adding extra plugs, joins, junctions etc, with the resulting voltage drops. There to the trailer battery is less than a 3 metre cable run, and about 4 metres to the aux battery in the car , all with 6BS cable.
I'll give the dc to dc charger a miss. Seen a lot of people waste a lot of money on them. For the amount of power we use, even without the solar panel, we get quite a few days before we need to top up batteries. Biggest load we have on it is a 35 litre Weaco fridge, which gets opened once a day, and a 14 litre one for drinks.
My power saving methods have been described as crude, but effective. For example, taking beer out of the fridge a six pack at a time, and drinking the last one before it gets too hot.
Thanks again to all for their input
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