Which fridge? Possibly with the 3 cubic foot but it would be close. The 69 would work. How about just putting a mattress on the floor? (Cutting a memory foam one to fit would work. But what's the point having the B if nobody can get to the bathroom?
The configuration guide https://f.hubspotusercontent40.net/h...n-brochure.pdf
says that the aisle is 27" wide if you're using a 3 cu ft fridge. The 4 cu ft fridge reduces the aisle width which is why Bobbie asked which fridge.
Seems like the cot would fit in the space "just right" with no room to squeeze past.
The width between the bathroom door and the front storage cabinet door is 25 1/2 inches. That does not include the 1" for the cabinet door handle.
The width between the refrigerator and the cabinet doors under the cooktop is 25", but the under-refrigerator cabinet door handles and the under-cooktop cabinet door handles decrease this by 2" and they might come into play with the 15" high cot.
Lastly there isn't a straight shot from the front dinette to the back dinette because the bathroom and refrigerator jut out into the hallway space. The hallway length is 76" from front dinette to the elevated floor in the back.
I have a 17B with the 3 cubic foot fridge and the distance between the curved fridge door at the peak of the curve and the closest cabinet handle is about 27.5". However, the bathroom door bumps out about 3 1/2", so the cot would have to be angled. My 17B has the extended front dinette bench option, which reduces that portion of the "hallway" to 23 1/4". That's 2 1/4" less than the normal model with the storage cabinet there.