We flew out of Trenton last year. 6:30 should be plenty of time. Unless things have changed, remember that there is NOTHING once you pass security. No restrooms, vending machines, nada. Only a few chairs and the door to the Tarmac are on the other side.
Things have changed, dramatically. After Security, there is now 2 gates, extra seating, bathrooms and a small snack bar with prepackaged sandwiches and munchies like potato chips, candy, bottled soda, not to mention a bar (not sure if they have the full variety they do upstairs or not).
A few other things to note
1. 45 minutes is the CUTOFF for checking in at the counter (including if you are just dropping off bags), so make sure to get their ontime.
2. They now have overflow parking lot due to the expansion of flights. On a Saturday odds are the 2 main lots will be filled and you will have to use the overflow lot 1 mile down the road. There is a free shuttle to take you back to the terminal.
So I'd get there by 615am, just to be safe being that you will have a bag to check. They also have a resturant upstairs located across from the check-in area, so you can get breakfast there after you check-in if you need to. Good prices, decent food and a great view of the tarmac.
Remember to check-in online and pay for your bag, its $5 cheaper doing it that way and there might be a seperate back drop off line (I forget, I never check a bag).