Codybear
Are you allowed to put up one of the Costco style car/trailer covers? They have a door on them. When you have the door closed no one can tell if there's a trailer in it or not.
The other thing is to have another distraction there, like a second vehicle you may leave at home - park it in front of that gate if you can so when someone is going by they see something there. It doesn't necessarily have to be the trailer....
Or, you could buy a nice little acreage or place with a big back area that when the trailer is back there it can't be seen anyway so no one will now when it is there or gone - that's what we have and it's great.
We have even just camped back there and with the creek and all the trees it is nice to hide out from time to time - and I still get to soak in the big soaker tub early in the morning too.....
Barry