Tranny Technique Actually The Same for Every Pickup
Next time lower your passenger window about 4 to 6 inches as you're pulling over for the SW, and have the doors locked. When she / he approaches, talk very briefly through that window, and make your decision based on voice and appearance, especially size of hands, and any facial hair traces. It only takes an extra 20 seconds or so. If you feel uncomfortable for any reason, that she may be a he, or that she looks like trouble, simply say "I'll pass", and drive off. It's your right and in your best interest to take these extra precautions, which are so simple and really common sense. Don't just let anyone in your vehicle without some scrutiny first. You are in charge of your vehicle and your decisions. Think with the big head always. If Leo approaches behind you, big deal, you pulled over to ask for directions, or to make a call or whatever you choose to say. They will let you go. They are more interested in the worker than you. Besides, He / She never got in your car, you were not there for that. Stick to one story, and you will be let go, perhaps with a stern warning, but let go. This is if that happens at all. Most likely in the 20 to 30 seconds that I advise you to take to ask a few questions, you will be left alone unnoticed. Glad it worked out in the end for you that time, but listen to the advice, and it shouldn't happen ever again to any degree.
Play safe, be careful always.