I'm looking at your running board/house connection on the rearward side of the cab.
I'd bring it through the filler panel between the cab and running board, along the house body and be done..
You'll never step on it and you'll never drag it.
One hole drilled through that filler piece, and 50 bucks at the muffler shop.
For the little money a muffler shop charges I doubt I'd do this myself.
And really consider just bringing it straight out. What are the chances of running the generator with the slide out, and whats the cost of one of the generator snorkel things if it does become a problem when the slide is out?
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