Yep on vibration, the Onan vibrates the whole back half of the van, like being in on of those massage beds.
Not to mention the noise. I will still use the Onan, but want an additional option.
I'm going to get a box, either one I showed or one I make. I will sound proof it to help reduce noise.
One good option with those RV generator boxes on the link is he makes them stackable so you could do 3 vertically instead of an Aluminess box using each box for whatever needed.