We've used a Wave 3 in our Hawk for almost a decade. We recently replaced it when the output seemed diminished. The pad is sensitive to dust, so our new Wave has a "shower cap" we put on it when it's not in use, especially driving dusty roads.
That said, we have been satisfied with the quiet, steady heat and do sleep with the unit set on low with vents cracked up top and below.
Our rough rule of thumb is that the camper is 20F warmer inside than the outside temp. If it's 30F outside, then inside will be 50F.
If we're sitting up, watching a movie, we'll put it on high, until bedtime. Our dog loves the heat and has her bed on the floor off to the side. I've mounted the Wave below the factory "blower" furnace, which was the only place I could find that had the required clearances.
06 Tundra AC TRD 4x4, 08 Hawk, Ride-Rite bags, Helweg sway bar,18" BFG AT's
2021 RAM 3500 Crew 4x4, 4.11 diff, Timbrens, 08 Hawk, Falken Wildpeak 35"