Advice from an auto elec needed please

This is for my mate, he has an 05 T/D D4D hilux single battery (no duel set up) he has a 17 foot windsor caravan he bought second hand a few months ago (06 model) it has a battery in the hood compartment with 240V charger monitor set up (all done by previous owner and a good job I must say extremely neat. The van just has your standard 7 pin plug on it so does the hilux. The original owner said he use to be able to charge the caravan battery and also run the fridge in the van (3 way fridge) while driving along on 12 volts, there is a switch in the van that has 12v or 240v when driving along he was told to switch the knob to 12v this will charge the battery and run the fridge from the accesory wire from the 7 pin plug on the back of the hilux, unless using 240 volt main to power light etc when in a park to leave the switch on 12v. Now Im presuming he would need a wire to be run from the battery in the hilux to the accessory terminal on the 7 pin plug so it will send charge through to the battery in the van ?? Im also presuming the fridge is running from the van battery not actually picking up power direct from the 7 pin plug I doubt it would handle that power draw through a 6 mil wire. My asumption is the vehicle charges the battery in the van while driving and the fridge is running off the battery in the front of the van ?? If Im write I would imagine he would need a dual battery controller in the hilux so it charges the main battery in the hilux first then will switch itself over to the wire that will run down to the 7 pin plug and send the power through that to charge the van battery or can he just get away with haing a fused wire direct from his battery to the 7 pin plug ?? or will he have trouble with draing the main battery or the alternator trying to charge 2 batterys at once and end up with 2 batterys neither fully charged. Sorry for the long post but he has been told by many different people including professionals different things evertime, some saying yes others saying no you need to run anderson connections others saying you will burn out wiring etc. He doesnt have the original guys ph number any more to ring him and find out for sure how he had his vehicle set up but he told me the old guy just said you need a permant power at the 7 pin plug and all will work spot on,,,,,,,,,Regards Steve
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