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I have to deal with this same equine scat. Get yourself some pepper spray and a nice hefty flashlight, and do not be afraid of driving through a red light or two if something at an intersection appears sketchy. And remember that your truck can be used as a more potent weapon than any gun you own.

Perhaps you may want to check on companyA's policy regarding firearms/ammunition, as you are parking on their property. Keep your eyes open for a copy of companyA's employee handbook, safety booklet, etc, and see what it says on the subject. Also see if you can figure out just how chummy the two companies are, and whether companyA would "blow you in" to companyB/your employer.

Finally, looking for a better job is always a good idea.