From what I've been reading about 48V systems they are most effective delivering power to high amperage devices like the A/C, fridge, and induction cooktops. With the heat pump, compressor fridge, and an induction cooktop, would there be any need for propane at all in this new trailer? They do make 48v water heaters with 1000-2000W heating elements.
Low amperage devices like lights, USB, etc. are often on 12v circuits powered by a DC to DC voltage converter in a 48v system, so there's no real gain there. (It is possible to get things like 48v lights, but they are more expensive.)
I wonder what the boondocking sustainability difference would be between our LE2, which has the 640Ah 12v lithium system, 30# propane tanks, and LP fueled furnace, fridge, water heater and stove vs. this new 48v model set up as all-electric? As it is, we've never gotten below 50% SOC while camping in good sun and our propane lasts for weeks.
Fresh water and holding tanks would still be limiting factors with this new trailer. I suppose if you had the composting toilet and were camped in a sunny place that allowed emptying gray water on the ground you could stay virtually as long as your fresh water supply allowed, but that's kind of an edge case for a lot of us. On balance, I see the main advantage of the 48v system over our 12v/propane system being increased A/C run time.