Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
I think if you want a better idea of a wheelchair user "off road" this BBC video about a nature program researcher who uses a wheelchair is better.
Which shows generally he needs an assistant (sometimes two), specialist equipment, and occasionally there are still places where it just isn't practical to get to.
Also the Beyond Boundaries BBC TV series.
Which shows what a struggle it is, that's the realism.
Yes, but that's a researcher, not a trained adventurer who faces deadly perils 6-8 times per day. And sure, the adventurer will have specialist equipment and help from their party members and other neat tricks and workaround. It changes things in-fiction, how challenges are approached and depicted, but it does not need a layer of mechanic and penalties.