Impressive. I like that you stayed away from that 8020 aluminum stuff. It's not light for one thing - I'm sure your steel frame is lighter than the same frame made from 8020, and vastly stronger and stiffer. And I don't trust all those screw fittings not to shake loose.
When I bought mine it had a second battery under the hood with a cable running to the back, with the aim of using a solenoid to keep a Jackery charged. Solenoids are highly problematic in that scenario, and I removed the second battery (it was completely dead - no surprise there) and put a 100 ah LiFePO4 in the back in the cabinetry and it runs a 45l fridge, lights, fan, etc. It has 2 x 100w solar panels on the roof rack and a 20amp MPPT controller. The battery is never less than 65% charged and if you get any quality sunshine for 3 - 4 hours it'll be 100% in no time. It's so simple even I can understand it, and does away with the cost and complexity of a DC/DC charger. I would only consider going to a DC/DC if I thought I'd be camping for extended periods with no sky view. Maybe if you're going to a heavily forested region it might make sense. Why the folks in Australia and Africa worry about them I don't know. Of course, having your own tennis court overhead with solar panels makes it possible. Otherwise the charger might be the only way.
When I bought mine it had a second battery under the hood with a cable running to the back, with the aim of using a solenoid to keep a Jackery charged. Solenoids are highly problematic in that scenario, and I removed the second battery (it was completely dead - no surprise there) and put a 100 ah LiFePO4 in the back in the cabinetry and it runs a 45l fridge, lights, fan, etc. It has 2 x 100w solar panels on the roof rack and a 20amp MPPT controller. The battery is never less than 65% charged and if you get any quality sunshine for 3 - 4 hours it'll be 100% in no time. It's so simple even I can understand it, and does away with the cost and complexity of a DC/DC charger. I would only consider going to a DC/DC if I thought I'd be camping for extended periods with no sky view. Maybe if you're going to a heavily forested region it might make sense. Why the folks in Australia and Africa worry about them I don't know. Of course, having your own tennis court overhead with solar panels makes it possible. Otherwise the charger might be the only way.