When they won't let you get out and spot them, you're pretty much at the mercy of the operator.
What type of trailer do you use? I haul with a little 10 ft dump trailer and it's definitely one of the most useful pieces of equipment I've got.
Discussion
I've got a 3500 lb single axle utility trailer with 12" high wood sides I put on it. It gets pretty regular use for a variety of things. It tracks about the same width as my truck so it works out great on the property anywhere I can get the truck.
Trailers are cool. :)