One of your problems is the Truma Solar Controller .. You really need an MPPT Controller to get the most out of your solar panel. With a 70 / 30 split its not surprising the vehicle battery is dying the MH is using more power than you are generating. You would be better off going down every couple of weeks and taking it out for a run. Dont just sit there with the engine running it won't do the engine any good. As the habitation electrics are switched off you could try divering everything to the vehicle battery.
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