I saw a picture of a 2015 and yes, the vent is just to the right of the pass through, driver side.
Access will be just like mine, take everything out of the pass through and the wall on the right (from drivers side) will have about 8 screws to remove it. Once you have it open you will see the furnace, in a very difficult spot to access.
It actually sounds like a propane issue, tanks are low, or not opened all the way or a regulator problem. These issues are a lot easier to check first before messing with the furnace.
This furnace experts might have more ideas on the furnace, exhaust plugged with a old hornet nest might be another cause.
All my furnace issues have been related to the furnace blower motor having issues (older rv’s), but that does not appear to match with your description.
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2017 Eagle 291RSTS
2017 Chevy Silverado Duramax 2500
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