When we last looked in on Chinese mobility company XSTO, it was for their all-terrain stair-climbing wheelchair.
The company has also adapted their stair-climbing mechanism to dolly carts. Their Self-Balancing Stair Climber allows the user to effortlessly hump 551 lbs up or down a staircase.

The load platform has arms that can extend sideways, allowing you to carry wider loads.

And at least in the demo, it looks remarkably stable:
The units fold down for transport.
These run $3,100.
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Reminds me of these I see in Japanese train stations.