I inherited the old pop-up camper that my grandfather designed and built https://www.youtube.com/watch?v=BV3o_wRL3ps&ab_channel=Groomporter which has been making me interested in the history of camping. So here's a few sources I've found. More Diesel punk than steamed...
Honorable Outfitters Mr. Dyer's Musings Early 1900's packs, sleeping bags, mess kits and similar topics https://www.youtube.com/@honorableoutfitters/videos
Tin Can Tourists a Camping club founded in 1919 with info on vintage campers and RVs and early car camping
https://tincantourists.com/getting-together-the-tin-can-tourists-1919/
sargevining Another Youtuber focused on the History of Recreational Camping of the 20th Century https://www.youtube.com/@sargevining/videos
Tin Can Tourists Camping in the 1920s Dan Hershberger describes auto camping in the 1920s at a Tin Can Tourists Rally https://www.youtube.com/watch?v=DASDASVlAVw&ab_channel=TerryBone
It's amazing what people put together in backyard sheds. Back in the day. Ingenuity, tenacity and a a flow of inspiration. It's wonderful journey that you have inherited in that campervan