my Avalanche has a 3-piece bed cover. i simply take one off and run the Honda inside, to make it quieterj and to provide ventilation.
never have fooled with a ground, don't feel it's necessary, based on Honda posts.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC