That's cool stuff, I couldn't survive a day in those conditions in Australia, barely in my own contry 😅.
I think you should definitely get that shopping cart for yourself, if you think it will make your experiences a lot nicer and smoother, what's a few hundred smackaroos for a better time going forwards.
The campsite picture you've shown here, looks actually pretty cozy and I see you even got some solar panels setup, very modern.
Come camping with me, I'll show you a few things; you'll be an expert in no time. ☺️
I have a legit camp set up, something I've developed over many years of being out there doing it. I have what I need and a little of what I want...I'd say I have a pretty good thing going. And yeah, solar input to charge batteries on-board.
Also...yep I'll be getting the stuff...I need it.