The talk feature will certainly startle passers by.
We use them at the house and only because they are battery operated hence easy to install and move.
They do work fine as security cameras but do have a few seconds lag time and probably a 20 foot activation range.
They also activate when our garbage trucks stop by due to noise.
Of course, when they sense an event, they will send a message to your phone. Even at 1:30 am....
I would think they would be good when the MH is unattended, though the last video they record could be of the thief quickly removing the entire camera......