Just as a note
We also do have the Trutrak device (TruTrak Pro 4G - FMT100 4G GPS Tracker) which connects straight to the battery in the compartment.
I was told by their team it hardly uses any power and only wakes up now and again to send the location. So I have a record of when the last signal was sent 20/11 and the battery was at 7.5V
Quote from TruTrak
‘The device has its own internal battery so shouldn’t take any drain from your own vehicle battery as the device only ‘wakes up’ every 6 hours when parked to ensure nothing has changed and the device hasn’t moved, etc’
I have now disconnected this device as it looks to be faulty, as Trutrak can’t see it powering back up, they want me to send it into them for checking.
Note: When I was back down at 14:40pm and since 12pm checked again and the battery has went from 12.48 to 12.41 and the charge LED on the Truma controller was off and the MPP green light was blinking, charge led was probably off as sun was going down.