I've never seen this before, a Model T accessory, the 1916 Automobile Telescoping Apartment (this is a replica) on a 1925 Model T Runabout

coolest thing I've seen in weeks, and I just learned (when looking for more info) that Autoevolution.com posted about it last year https://www.autoevolution.com/news/in-1916-100-got-you-a-ford-telescoping-apartment-the-world-s-first-slideout-camper-182664.html

https://patents.google.com/patent/US1196309

https://forums.aaca.org/topic/374586-the-first-slideout-motoring-home-1916-automoblle-telescoping-apartment/

an original was found, and is on display in the RV Motorhome Hall Of Fame Museum in Elkhart Indiana  https://ladailypost.com/posts-from-the-road-rv-manufactured-home-hall-of-fame/