This is in the untested phase still, but ...
Just moved up from a PUP and miss cooking outdoors. In 13 seasons I heated one kettle of water indoors in our popup and cooked on the outdoor stove the rest of the time. Not entirely willing to give it up.
Our Passport came with an outdoor grill, with a mount on the side similar to what we had on our Coleman, so I set out to replicate the Coleman stove.
I purchased a two-burner Atwood stove and mounted it in a piece of wood that I then attached to the frame used for the outdoor grill. Had to do some bending and contorting, but made it work.
Inside the stove, I removed the regulator since the flow to the grill already is low pressure. (The grill didn't have a regulator on it either.) A few brass plumbing parts let me connect it to the same hose that came with the grill.
I haven't pressure tested yet, but that should be simple enough when the camper comes out of storage out at a friend's farm.
Slightly concerned about the weight, but the similar mount easily handled a slightly smaller cooktop mod I did on the Coleman, so I'm hopeful. If it ends up too heavy, will just look for a low table and not actually attach it to the side of the camper.
Only goof I can see is not cutting the stove hole very tight. Gave myself wiggle room, since I don't have a router and used a hand jigsaw, but didn't get close enough on one corner.
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Here are some photos.