If it is like mine, it is mounted with a V type flat mount. The TV lifts straight up but there is a tab at the top to stop the mount from coming apart.
This tab is all but impossible to reach so try lifting up on the TV and wiggle the top of the TV back and forth and it should pop out.
I have a different trailer than yours so maybe someone with a windjammer can comment
Todd & Sheila and kids
2012 Surveyor SV-305
2012 Dodge Ram 1500 4X4 CC Outdoorsman