Charging caravan battery through Jeager Tow bar plug

Is it possible to use a Orion-Tr Smart loader (in my case 12/12 18A) between the 12V in the Jeager Tow bar plug from my car to the 12V LiFePO4 battery in my caravan to be able to charge the battery during driving? Normally you would prefer a 16 mm2 cable from car battery to the DC-DC loader but that is not available. 12V from my car has a 10A fuse and is probably only 2,5 mm2.