No dealer is going to "yank" your deal because you posted on a forum.
Source - I've bought countless cars like this. My mom was in the car biz for 40 years. I was in it for 5 on and off. Just....Stop. It's ALL about finding the right dealer at the right time and the right car.
All dealers have "goals" and "marks" to hit. ALL of them. High volume dealers get piles of kickbacks and they can go into "holdback" to make a better deal, than a small time dealer at the end of the month if they are short their mark / goal for a bonus or kickback from the 'Mfr. Some are willing, some aren't.
Sales managers don't monitor places like this. They far to busy pressuring their salesmen to follow up, packaging deals, going to meetings, dealing with problems, heat cases, vendors, and more. They do not give a singe **** about you. You are a tick mark on that big white board in their office and when you buy a new truck you're just another "mini deal" to your salesman. He doesn't give a crap if you pay 1% or 10% under invoice. Its ALL a mini to him. He won't make any commission money unless you pay MSRPish. He is not holding out on you. If anyone is, the manager is.
Even if I know I am buying, I ALWAYS stall to the last week of the month. If I don't get what I want, I balk. Bye. There are thousands of these trucks out there and hundreds of dealers. You aren't compromising your deal. You aren't special. They need you more than you need them. The sooner you realize that, the better your position will be. They care about one thing. The money in your wallet. Not you.