When you park creatively that's the risk you take. You very likely could be boned and stuck until everyone else moves. If they literally just parked next to you you could try talking to them and asking if you two could trade places, but if you talk to the truck stop about it they're definitely either going to make everybody not parked in a spot move or more likely they're not going to do shit because they don't want to have to get the cops involved and a tow truck and likely get threatened with violence.

You're boned. Let dispatch know immediately that you're parked creatively and might be delayed in leaving in the morning and that you'll update them when you get up. That's the best you can do that doesn't threaten to blow up your clock and force you to move. You also need to go to sleep now, like right the fuck now, because all of you are likely getting a knock on the door at 5am sharp and told to move or you're getting trespassed or towed.