My personal opinion is that it depends on the van’s option and also how you will use it.
#1) Standard specs show 200 Amp-hour lithium battery, with optional 800 Ah Re(Li)able system. That is quite a difference, and you didn’t mention which one you are planning on.
#2) Will you be using air conditioning other than when at camp grounds or other locations with shore power?
The standard lithium batteries (2 X 100 Amp-hour each) along with 3,000-Watt inverter could handle most normal camping needs as long as it doesn’t involve powering the air conditioner, particularly if driving every day.
The optional 800 Ah Re(Li)able battery system should be able to power air conditioner through night while sleeping, but if running A/C 24 hours a day in hot weather, the dedicated second alternator would require van engine to run too much, so I would get a portable generator.
I would not need a portable generator if I had 800 Ah of lithium because we drive every day.
I would definitely need a portable generator if I only had 200 Ah of lithium.
P.S. — We traveled successfully for many years without a generator because we always stayed at campgrounds with shore power, and had no need at all for a generator. Years later we started to boondock without shore power and ended up buying a portable 2200/1800 Watt inverter generator to power air conditioner to sleep through night in warm weather. When cool, generator stays at home.
In my opinion portable generators are a pain when traveling, and much worse in a van where there is no room to haul them without adding a cargo box. That’s what we do, but it extends length of van beyond that of normal parking spaces. I did it as an add-on, but would not buy a new van on that basis. I would either get the 800 Amp-hour battery option (if affordable), or find a different van with the built-in Onan 2800 Watt inverter generator mounted under floor.
Basically, we need air conditioning through the night too often, and that drives our equipment needs. For now a portable generator is a necessary evil I want to eliminate as soon as possible. Relatively speaking, it’s a PITA for the kind of traveling we do.
__________________
|