If you want to be able to use the Pepwave when underway, you'll want to use a 12V feed that is not ignition-switched. I did, and I did. In fact, the 12V I used on my coach didn't go through the house battery disconnect solenoid activated by the switch at the door. The only way to shut it off was to use the rotary switch at the house battery bank or pull the fuse to that circuit.
Your coach is different than mine was, so only the first sentence above applies for you!
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport