First, so sorry for your loss.
It is difficult for us to be very helpful without a bit more information about the trailer. For instance, is it the standard Safari or the upgraded Safari SE? What condition is it in, with regards to both the body and the interior. Have you made improvements (like solar systems or lithium batteries) that might add to the value? If possible, some photos would be helpful.
Maybe a local dealer, who would know your local market, would extend the courtesy of helping you. For what it is worth, and assuming that everything is in good condition, my wild guess would be in the $30-40,000 range.