Hi Don,
What I have done in the past is to park my truck and trailer on Getty road just short of the stop sign, and unload the tractor there, then work on the entrance until I can move the truck and trailer onto SSI property.
If I do that, I would need someone to stay in my truck until I can move it.
Dick
PS How much in a hurry are you to get this done?
You can give me a call on my home phone at 815-923-216 I will be here today until around 1:00p