That's the kind of apparatus that one could use if one owned (or had access to) a nice piece of private property such that it would be unlikely that trespassers and thieves would mess with it. The dog could be left unattended if the owner was some distance away.
My only potential concern in that scenario is the scent of my full pantry wafting out to the nostrils of the local bears. When I'm parked, I've always got the van under negative pressure (Fantastic) just in case a bear strolls by. He might smell food in the area, but the smell would be ejecting out the roof and hopefully it would be harder for him to pinpoint. I've seen pics of bear damage to passenger cars (low windows) and cheap campers (just rip off the aluminum siding) but not to large vehicles like Class Bs.
And I'm talking about black bears here. Grizzlies - forget it in any scenario, they can get through almost anything. Black bears are more easily discouraged.