We don’t know what surrounds this property, so just basing this on the image provided.
Who owns the horse area? If you have people over there, then absolutely not safe. Assuming image lays top=north, does anyone access the trailer from the South? If so, that’s an issue. Assuming nothing to the northwest would prevent it, reversing the range to shoot from the current berm towards the current firing position would be better as far as the trailer is concerned.
I’m sure you do, but keep in mind the limited field of view when shooting with a high power scope.
FWIW, if all the requirements listed in this thread had to be implemented, there wouldn’t be many ranges in this country, at least not in the east.