Do you consider the main cargo area to be the one that goes through from one side to the other?
Yes, pretty much as Russ described. Our coach is short, and the big bay doesn't go all the way across, side to side in its entirety, except for a 15" or 18" wide area open to the street side via the wet bay. Its slide obviously only rolls in the curb direction, but the narrow thru opening is still handy sometimes. Our "whole house" Dirt Devil vacuum base hangs in there, and I'd forgotten its outlet hides there too, as Russ notes. Also, If you have an ice maker/dispenser on the fridge, it will have its own circuit outlet independent of the fridge's, behind the fridge outside access door.
I reckon how many potentially useable outlets there are depends on what options came on your particular coach, and which among them can be temporarily hijacked for unintended uses. Extending a circuit to your bay can be tricky, if like mine many tappable outlets are in slideouts that move. If you have a vacuum like ours that's not in a slide, at first thought I'd think it relatively easy to splice into it and run over to the curb side and mount an outlet. Just be aware of total potential amp draw on that breaker, etc.
Joel