The Outback Terrains have a domed cieling, and is 83" high in the center, and 78" against the wall (just went outside and measured my own Outback Terrain). The shower also has a big skylight so even with your height, you'll prob fit. I'm 6'1" and have several inches above me to spare. At the highest point the skylight is 79" above the shower floor.
Many brands made the exact same Floorplan as the 250, but I don't think any do currently. Frontier, KZ, ect. They all had 78" ceilings though.
2016 Ram 1500 Big Horn, "Katy"
2014 Outback Terrain 260trs "Alice"
2011 French Bulldog Shelter adopted edition, "Roscoe"
1982 DW, "Rachel"
2016 DD "Harper", the newest lil camper.