Ah, but I don't think we disagree. Ha. My opinion, like yours, is that faster DC charging is more usable than faster AC charging. Particularly with a large battery bank and plenty of alternator output. And also for slide-in type pickup camper since this type of rig is less likely to frequent campgrounds or places with shorepower access like the big RV rigs. We are more likely to roam and camp dispersed.
What I mean by "demand for larger DC/DC charging is limited" is that, according to Supertramp, there are not very many owners requesting faster DC charging. I imagine the request for faster DC charging is based on such things as size of battery bank, average daily draw and available DC output (alternator output) from any given pickup.
I might be off, but it sounds like majority of Flagship buyers are optioning for only 100 - 200amps of battery. Not sure the take rate for A/C. It seemed quite low early on but lately I've noticed more and more A/C units in pictures of camper deliveries. Not sure if A/C take rate is ticked up to 20%, 40% or what since it's hard to gauge since Supertramp doesn't post a picture of every delivery. Another big power draw would be those that are use a lot of electronics for work or play (computers, starlink, drones, cell boosters/hotspots etc.). Seems like for owners without those big power draws (A/C and computers/connectivity), the average 24 hour power draw would be 30 to 40amps. For users with that level of draw, they are covered by the combination of solar and 30amp DC/DC. In my last pickup camper, with one 200watts of solar and one 100amp LiFePO4 battery, I usually never even flipped the switch to allow 30 amp DC charging because the 200watt panel would have us 100% SOC again by noon on sunny days, by the end of the day on cloudy days, and only on rainy days would we only recoup only about 1/8 to 1/2 of our daily use. Some is better than nothing. And by the time a few days went by and battery got low, we'd have a sunny day again and get back up to 100% SOC. Our daily use is usually 20 to 40amps per 24 hours depending on the season. I only recall connecting up the DC charging once and that was after 5 days straight of pouring rain on a September trip to the PNW.
One factor I'm not including in the 30 to 40amp average daily use is the electronic actuators. Not sure how much each up/down uses. That would be yet another important stat to know. Maybe it's only an amp or two or maybe it's a surprising bit more.
But back to "power users" (those with A/C, heavy draws from electronics, etc.). I agree 100% that more DC charging capacity would be handy for those owners. I'd be really curious for someone to do a power audit, of their 24 hours consumption, while using their camper as an office with big monitors, starlink, etc. I have no idea if that bumps a typical 24hour draw up an extra 10, 30 or 50+ amps over 24 hours.
The second part of being a candidate for bigger DC/DC charging is having the alternator capacity to push them. I'm still surprised how many Supertramps, and campers in general, are going on Fullsize pickups rather than SD/HD pickups. I don't know how much overhead the typical Fullsize pickup alternator generates, but a lot of them only have 130 to 180amp alternators so I suspect they don't have much overhead considering today's accessory-full pickups are power hogs. Plus, the listed amp rating is only at a higher rpm. At idle or cruising at really low rpm (like todays 10 speed transmissions paired with turbo engines, big displacement gas, or turbo diesels, seem to do), the available amps is much lower than the alternators listed amps. The van crowd, or as part of conversions, such as Storyteller vans, put in extremely large alternators and huge DC chargers for their huge battery banks. Really interesting some of the capacities there. The drag, from one of those alternators putting out max amps, is probably quite high, too.
It would sure be interesting to see statistics on installed Flagships regarding what pickup they go on (Fullsize or HD/SD and so one could guess at alternator sizes and available DC input) and a break down on Flagship battery bank sizes, how many are optioning for the A/C, inverters, etc. Might be eye opening for me as my guesses are anecdotal and based largely on various Supertramp owner pickup pictures, posts in the FB owners group, communication with Supertramp, etc. I don't have any hard statistics like I prefer. It would be really interesting.
