Worked for a company that had a horse float not for horses, had awnings, internal, external tvs, generator, obvious sink, water, fridge solar a must today. Go to https://www.camec.com.au/shop for caravan stuff ignore 240 volt fridges must be 12-24/240. Be careful with 3 way fridge they consume massive power when running in 12v mode. https://www.dometic.com/en-au/au will run days on batteries etc.
Windows hatches aircon so much more.
I fitted out my bus with Stove, water, 2 fridges forgot I have microwave also bolted in place.
Go to your local caravan yard and have a good look. So much stuff out there pull out BBQ a must.
Pretty sure sent you an email link any questions ask.