By all means get one of Drivesafes systems and if wanted put a aux battery in front of the main battery or in the brake box in front of the driver.
I have gone the cheap basic system - I just have run a fused cable from the positive cable on the car's battery to the rear of the car with an andersen plug. As Drivesafe has indicated the RRS system is quite capable of charging both the car battery and the deep cycle battery in my camper and with 110ah available in the camper and up to 90ah from the car battery I really do not have to disconnect the camper from the car when stopped when travelling - but of course you must not forget to disconnect the car from the camper when camped.
If I have an issue with a low car battery I can charge through the andersen plug.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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