Got the Ecoflow Alternator charger this week as well packaged with a Delta 2 Max kit on black friday through a Costco deal. Delta 2 Max + Delta 2 Max extra battery and Alternator Charger all for 1499. I mostly got the Delta 2 Max for home backup (to make use of the 30% tax credit). I should have picked up a $375 Delta 2 as well for the truck, but I definitely have already blown the budget for tools and toys this season.
Mostly posting here because i haven't seen it mentioned yet. Victron has a new DC to DC box called the XS. It's 12 | 12 @ 50amps and is 98% efficient. Youtubers have showed that it runs considerably cooler than previous DC to DC chargers and it has all the cool Victron things than any of their smart devices have. If you want high amp charging and are connecting to a battery rather than a "solar generator", this is probably the new go-to top of the line device. Looks like it's about $330.
Victron XS