I think the US has the upper hand to a ridiculous degree with
any other negotiating partner. It simply has a lot more chips than anybody else.
I don't really buy the idea that the US was getting 'bad deals', as Trump puts it. To be honest, I think the only way the US could get bad deals is if it undercuts its own state department, and does everything it can to project an image of instability, insanity, and dementia.
The thing is, in the normal run of things, there are no incentives for anybody who isn't totally desperate to try and screw the US over. Unless the state department is utterly braindead, they just have way more resources to screw you back. Except, in the situation where you think that jeopardizing relations with the US is acceptable, because it's a fading power, or because it forgets its friends and enemies with the election cycle. Which are all things Trump is really good at convincing people of.