Hi Joey,
Welcome to the Heartland Owners Forum. There's a lot of useful information here along with a great bunch of helpful people. I'm sure if anyone has used overnightrvparking.com they'll let you know their opinion.
You might want to also take a look at
Allstays.com, which has free info on truck stops (most will let you stay overnight), campgrounds and much more. You can also
stay at many Walmarts (they list the ones where local regs prohibit).