Volvo used to make wagons with rear-facing seats, imagining the fun being the kids with your own space there. Some even have a phone to talk to the front seat. : r/Volvo
4 Seater WonderFold Wagons
Step2 Red Neighborhood Wagon with Seats
30" x 60" 2 Seater Wagon for Kids | Model #920 - Lapp Wagons
Ktaxon Stroller Wagon for 2 Kids, Featuring 2 High Face-to-Face Seats with 5-Point Harnesses, Removable UV-Protection Canopy, Black Camo - Walmart.com