Locating tracker device

There are people who'd find it within minutes. 

I think the whole point is that we don't know where it is and certainly don't reveal it’s whereabouts on a public forum.

I recall seeing a Lunar where the tracker was fitted between the back panel and the framework so access would have been by removing the back panel or cutting the wall board if you new where it was!!!You could try cancelling your tracker subscription!

If Tracker is warning you of a low battery then your caravan battery is also in a bad way. The Tracker installation includes a 12V 7Ah gel lead-acid battery which should keep the alarm healthy for about a month if you remove the leisure battery. Otherwise the two batteries are effectively (almost) in parallel.

If your van is in storage why not get a small solar panel that you can mount in one of the rooflights to keep it topped up? The power consumption of Tracker is very low. 7Ah lasting a month equates to about 12mA - and assuming a battery would be considered flat at about half capacity realistically the consumption is no more than maybe 5mA. (You can ask Tracker tech support - they will tell you.)

I'm curious what you mean by a " third party tracker device that is not reliant on the caravan battery." If it doesn't use the caravan battery how will it activate if your van is stolen or burgled?