There are a few options for running an outlet to under the stove. I'll lay out how the wiring runs so you can decide how you want to do it. Reason I say it that way is because you may make a different choice than I did. I used the microwave wire; the way Chinook wires, the microwave outlet is dedicated to ONLY the microwave so is fairly under-utilized (especially in my case). Hence I have a super robust circuit for a floor heater. If I (well, someone else) reinstalls a microwave then it will still work fine, but one wouldn't want to run both at once.
So anyway, here are the candidates:
1) The Outlets circuit.
I took this one off my list of choices. Reason is it's the smallest wire they used (14 gauge) and powers ALL the outlets, plus the refrigerator (when on AC) and the TV compartment (also an outlet). But if you wanted to use it that's fine, just be aware of what you are drawing from any of the other outlets (including the outside one) and the refrigerator. The closest it gets to under the stove is where it runs across the outside wall behind the refrigerator (just under the lower vent, above the generator box), and then to the outside outlet (after that it goes up the wall to the overhead cabinets).
2) The Air conditioner circuit.
This is a larger wire, at 12 gauge. I didn't consider this one because to me, the air-conditioner isn't something you want to have to shut off in order to power something else. Granted, if you are using the new outlet for a heater this may not matter, but it just didn't appeal to me (even though I have removed my air-conditioner - I wanted to keep the circuit "sacred"). If you do want to use it, the wire runs along with all the other AC wires along the outside wall, below the refrigerator vent and above the generator box, then up the wall behind the stove, and to a junction box that is behind the microwave (you can see it if you pull out the microwave). This isn't a junction box in the sense of one wire branching into two, but I think was used because they molded the roof part of the Air-Con wire in separately, then needed to join it to the part that travels around to the other side later, hence a junction box. Also I think they may have "pre-wired" this roof wire in Chinooks that did not come with Air-con, so if you wanted to add it later, the roof wire and junction box would still be there.
3) The Microwave circuit
This is another "larger" wire, at 12 gauge. It's sole purpose is to power the outlet that the Microwave plugs into. I decided to use this wire for another "dedicated" outlet near the base of the stove counter (so this wire now serves the one floor outlet, and the microwave outlet). I wanted an outlet near the floor, and to have it be one that wasn't on the already-used-for-darned-near-everything Outlets circuit. As it happens, I've also removed the microwave, but even if I were to put it back, I'd rather just keep track of one thing ("am I using the microwave?") rather than all of the other outlets, the refrigerator, the entertainment area, the outside outlet, etc. Ha, now I'm trying to remember where I put the junction box! Without taking drawers out to look, I think I put it in the cubby area that is aft of the wheel well under the stove. But I can't remember for sure at the moment. Oh, you know, now that I think about it, I probably made the stove outlet do double duty as a junction box. The main thing is just to do it in an electrically proper way, which means a junction box or outlet as junction box (no hidden splices in AC wire).
As mentioned above, all of the AC wires that go over to the passenger side, do so in a clump over the rear door (they are in two wire loom conduits, separate from the DC wires conduit). They stay "high" until they are in the very rear/passenger corner, at which point they come down the wall in the very corner of the closet, go forward and over the generator box (just below the fridge wall vent), and then head up the wall behind (outboard of) the stove area.
4) There are also AC wires that go to the generator and the shore power, but you wouldn't want to use those for probably obvious reasons.
This may be more than you want to know
, but I always enjoy the "guts" photos posted by others. So in that spirit, here are some photos that show the basic layout (at least on my '99; but my guess is this didn't radically change on any Chinook with the same basic wiring layout (i.e. at least '97 and newer - but I've seen some photos of older 18+ models with some very similar wiring).
Okay, so here we start with the wiring that goes "across the great divide' - from the driver's side to the passenger side. Here are the three main looms as they pass over the rear door. The large upper one is the DC wiring (would be nice if it were not in such a single large bundle as that de-rates the wire quite a bit but oh well it seems to still work fine); the middle one is AC wire for the generator and microwave; and the lower one is AC wire for the outlets and Air-conditioner. This is accessible by removing the carpet "hump" over the rear door.
Next it continues on at the ceiling/wall junction until it gets to the rearmost/outboard corner in the closet. At that point the DC bundle splits, with some heading straight on across (where it can chafe on the refrigerator fins - something to check), and some splitting downward along the corner. The AC wires all go down in the corner (I think that one AC wire going across to the left is one I was in the process of adding for an outlet by my new hall counter). The thing in the baggie is the inside generator control that's in the closet front wall. So in other words everything on the right half of the photo is rear wall, and the left half is outside passenger wall. This is only accessible by removing the carpet "wall" of the outside of the closet (in my case, having navy carpeting, I was tired of the "black hole" and so will be putting back marine hull liner carpet that is more similar to the overhead carpeting in our rigs - it's such an irregular wall that carpet is more practical than something like wood).
This one is a little messy, as I was starting to "do things," but is the bottom of that same corner, looking down from above. As in the last photo, right half is rear wall, left half is passenger wall. The silver box is the generator surround, sans carpet. Again, this is behind the closet carpet/wall.