Has the trailer been stored under cover when not in use? Yes, I'll try to send you a picture of the enclosure.
And well ventilated? Yes, There is a vent just above the bed that serves as an emergency exit. A MaxFan int the main area, near the galley, and a fan in the bathroom. Also a fan in the exhaust area above the two burners.
Are there any systems not working properly? Everything is in working order. We often add a cleaning agent to the black water tank (toilet).
Would you like to schedule a virtual tour? We can do this via Facetime or Zoom.