Your image shows:
- A V‑shaped front layout for water tanks
- A bathroom zone directly behind it
- Shower on one side
- Toilet on the opposite side
- Tank depth around 3’11”
- Total front section tank depth 8’5″
- Another tank 3’11” behind the bathroom
This is perfectly aligned with your trailer’s:
- 8’5″ V‑nose width
- 18″ V‑nose depth
- 4’5″ angled side walls
- 8’1″ finished interior width
- 21’2″ total interior length
Your drawing is essentially a scaled architectural version of your trailer’s front 8–9 feet.