Saberr -
I have no specific knowledge, but I would not bet that the roof of an older model is strong enough to support a new airco. This is particularly true since the new airco units are located near the open end of the roof arch. If I were going to experiment, I would mount the unit near the end wall of either the front shell or the rear shell, so that it could gain some support from the end wall.
A possibly helpful point. When the roof aircos were first added to the TMs, they were on the rear shell over the bed (as mentioned above), and had a power cord that simply hung down inside. After setting up, you were expected to grab this cord and plug it into a handy outlet. Not very elegant, but quite effective.
Have you considered an alternative approach, such as mounting a second window unit in a handy place on the floor up front - maybe in one of the forward cabinets, under a dinette or couch, etc? I can't find a floor plan for your unit, so I have no specific suggestions. But mounting it on the floor would allow you to run the power wire under the trailer, rather than in a wall or roof channel.
There was a good thread a while back about sizing the hole, cutting the hole, mounting the unit, adding louvers, etc. In some ways, it could be more handy to have two small units, rather than one big one. It would also give you the opportunity to run the wiring under the floor, rather than in the wall or ceiling.
I've thought about adding a small window unit under the couch of my 2720SL ...
Bill
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