When I said "If you notice her checking out your truck tell her you noticed it. She'll feed you some line. If she's embarrassed and it's true she'll blush, if she's confident she's going to admit it anyway. Either way you just ask her if she wants to go for a ride sometime being c/f." I was really just saying you should use that to open her if she doesn't say anything or she was shy. It's direct.
1. In this situation... Just be direct but be c/f. Tell her you noticed her checking your truck out and then ask her if she wants a ride in it.
2. Here's direct vs. indirect:
http://www.rooshv.com/direct-game-vs-indirect-game
3. Be cool, let her take her time and don't intimidate her. Let her know she's not under pressure and she's making her own decision.
You're talking about unnatural game and probably read Mystery Method. Great book for structure and theory but you don't need that in this situation. You have a girl who likes you but she's shy. Be the man, take control and don't play her. There's no game in a situation like this just guidance really.
The only advice you really need is to be direct, indicate you're interested and leave it up to her given the situation(Don't shit where you eat crap) without actually telling her you want her. You want to play it off safe seeing as you frequent this place.
This is what you do: "Hey, noticed you checking out my ride." She'll laugh or be quiet and shy and say something. Don't get too bogged up in the conversation with crap about your truck just lead straight into "I'll give you a ride sometime." She'll either say yes or no. If she says yes -- even jokingly -- tell her you'll pick her up when she gets off work. If she says no be c/f: "You're missing out, it's as good as it looks." If she still says no just play it cool and say "I'll see you around, Cindy(Whatever her name is)." If you leave it open like that you've left with her name and some rapport and can always refer back to giving her a ride in future interactions if things go well. Remember, if she says no it doesn't mean she's not interested just that she's cautious so don't be disheartened by it.
Now, I know being direct is basically saying you're interested in the woman but in this case asking a chick to get in your car is pretty damn direct at least in my opinion. Try not to get confused with direct and indirect.
Don't put too much on your plate or obsess over things right now. Learn about time constraints and other stuff but experiment with them on your own once you have a full grasp on how to use them. You'll see what works for you and what doesn't. Basically what fits into your style. After that ask around on forums for specifics.