I'm not sure ?
I do know that the Eagle and ATC frames are different.
With the FWC Eagle or Fleet Models we do not have room on the rear wall for an air conditioner.
(the camper is just not wide enough)
The Eagle on the Tundra with the AC unit installed upper / driver's side / rear wall pic must have been an empty shell model and the customer installed the AC unit on his own.
I think the AC unit we normally use is approx. 18" wide ??
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Stan - Assuming the FWC eagle and ATC bobcat right rear frame are the same.
Do you know the dimensions of the hole in the center of the boxed section?