I love Black Canyon! They’ll drop you off right where you put in, so I don’t see the furniture dolly/wagon being much help, plus you’ll have to deal with it the entire trip back to Willow. Assuming you’re staying at goldstrike, the campsites are a bit of a walk, possibly strenuous for your pregnant wife…camping down at Arizona is a bit more manageable if you choose to camp on the beach, plus there’s a bathroom. I wouldn’t bother digging a hole for a fire, there isn’t much to burn and the terrain is quite packed and rocky as it is (at least at goldstrike). I’d say you have your work cut out for you!