Of particular interest to me, a person asked Robert about upgrading the wire from the camper to the truck to a thicker gauge. He said that engineering had told him that 10 gauge was quite adequate for 30 amps. He certainly was aware of the grumblings from FWC owners and did allow that they might upgrade the wiring just to make people happy. I spoke with him after the Q&A and said the problem was not current but voltage-drop at the DC-DC charger and that trucks with smart alternators needed a DC-DC charger. He responded that very few trucks had smart alternators. Very much to his credit, he said to email him if I had better information, so I did. I documented what vehicles had smart alternators (all Tacomas from 2016 and most Fords from 2017 and most other trucks from around 2017) and that Redarc and Victron both point out the need for DC-DC chargers with smart alternators. I think it likely that the pressing production problems leave little time for other issues to be properly addressed and so it may be a while before there is any change.
Interesting report Jack. We received our camper in early January of 2020 and have spent maybe 150 or more nights in it in all seasons. Hot, cold, cloudy, rainy or sunny in Oregon, Washington, Nevada, California, Arizona and Utah. We have 170 W of solar, two deep cycle lead acid batteries, the large 3.1 cubic foot fridge, led lights, water pump for various needs, USB charging phones, furnace running sometimes. My point is the factory wiring has never let us down. Charges to 12.7 to 14.2 without fail. So, at the risk of causing a ruckus, our experience is the factory engineers have it right. Now I better knock on wood.
We have a supplemental 100W solar panel, which I set up for the exterior Zamp plug, but have never needed it. Still carry it around everywhere we go. But in our experience I would have to say Robert Vogel is not pulling anyone's leg.
My apologies to the wise electrical whiz folks on this site that say you need 4 or 6 gauge wire (I bought some, and it is waiting in my storage cabinet should I ever need it.)