If you have specific questions about the EOS-12 let me know and I'll do my best to answer and give you my knowledge and experience. I picked mine up in late June. It's just me, my wife, and the dog.
As far as price, yes, not cheap. Also, not as expensive as some other options and it is absolutely made in the USA and uses top tier components throughout. No weird mix of some top tier stuff and some mid or lower grade stuff. When looking at much of the greater off-road trailer market, I feel like you are getting top quality throughout for the cost. Honestly, I can't think of anything on the trailer that wouldn't be considered a top-tier component.
While it is a pop-top with canvas, it is still built to handle cold conditions decently well. All plumbing is running internal to the trailer and often right along a heat duct coming from the Truma Combi Plus. It has tank heaters on fresh and gray tanks. Walls are full composite and an R7 value. Roof is full composite, almost 2.5" thick and an R8 value. Floor is a full, I think 3" thick, composite. All that being said, I'm not heading for blizzard conditions but so far we have been plenty toasty down into the 40's. Might see some higher 30's this next week.
The Cruisemaster XT air suspension is awesome both for travel and for leveling at camp.
I have 500W of solar with 400Ah of Battleborn lithium. All power components are Victron including the 3000W inverter. Even after 6 days completely off-grid the lowest I have seen my battery bank is 70%.
50Gal is a lot of water for us. We are not shower everyday campers. We barely fell below 50% water on the 6-day trip and that included 4 military showers. The shower is the only thing that drains into the 40-gal gray tank so we haven't even come close to filling that.
Off-grid I think your first limiting factor is going to be the cassette toilet if you use it exclusively instead of watering the forest. I'm considering swapping to a composting or other waterless toilet option eventually. If you did fill up the cassette before you are ready to leave you can always pull the cassette and go find a dump though. So, the cassette isn't going to make you pack up camp like a small onboard black tank might.
I have plans for some mods to better suit how my wife and I want to use the trailer. Mostly some interior mods like some dresser drawers and maybe even a small kitchen counter with tiny interior sink. I removed the table as we found it too big and in the way. We will never use the second bed option. A portable folding table will work perfectly if we are ever driven inside to eat in poor weather.
Feel free to ask anything else you want to know.
