Depends on your equipment, usage and expectations.
Running 3B&S through the car to the van's 8B&S wiring, I had a decent amount of initial current flow to a depleted van AGM battery. Performance rolled off as the battery charge increased... however that happens anyway. I spent the money I could have used installing a DC-DC in the van on improving the solar. This offered value when parked up as well.
However I found the wiring arrangement very limiting when I changed the van to LiFePO4 batteries. I now have a 40A DC-DC next to them.
It's important to factor in the "acceptance rate" of your battery when planning your recharge system. If the battery will not take the amps available, it becomes a function of time instead. So a good question is "how long is the drive"?
The alternator in the MY14 has never been an issue for any of my configurations. Given a DC-DC charger should go in the van, and as the car cabling still needs to be decent, you might choose to see how you go until you really know where your needs are.
What fridge does your van have? Decent power to 3-way types is extremely important...
Cheers, Steve
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