18k trip, this must have been a fantastic experience that I am sure you have many stories and advice for other van travelers to learn from, is your van converted to a camper or did you tent camp? Have you written your trip up anyplace or perhaps you're on YouTube?
I just returned last week, and the winter's project is to review 600 GB photos and present them in some sort of series of viewable YouTube videos. I converted my 2013 Sienna and camped in it every night except for 4 (our anniversary, seeking shelter from a hurricane, and a huge winter storm). It took about a year to convert, but it has a furnace, fridge, solar panel, 120 volt inverter, water and a sink, and of course a bed. Cooked outside, mostly wild camped (outside traditional campgrounds for free), stopped at many dozens of microbreweries 🍺, and saw a huge amount of Canada and northern USA. I highly recommend retirement.