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Greetings Tim,
Likewise, I added air to my 56 Overlander. By placing the unit over the middle vent, after removing the fan and taping off the electrical wires, I found that the seam of the outer shell and the vent were close together. There where two ribs about 20" apart and this I felt was enough strenght for the unit. This might be also true in yours. Instead of removing the rivits and lip in the opening 14 x14, I had to cut the corners and fold down enough metal approx. 1", so that it would not ride to high and this also cured any leaking that might have occurred from new rivits. It also strenghen it somewhat. After changing over the screw in type fuses to a breaker panel box with a seprate breaker for the Air...the hardest part was drilling a hole from the opening over to the overhead cabinet...and fishing the wire about 16"...1hr. later!! All wiring leds to rear through the cabinet as high as I could make it so its out of sight. Iv'e taken my unit over 4000 miles with no problems.
I did this job by myself...although a little help in putting the unit on top would have been nice but wasn't available.
Hope this helps.
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