Rex -
What year is your 2619?
I think 13,500 or 15,000 BTU is the right number for you. Have you considered how to get electrical power up to the unit?
I have never heard that TM sells a "kit of parts". I think you would need to install it according to the installation instructions that come with the unit.
Be aware that if you add that kind of weight to the roof, you will have to adjust the tension on the torsion bars that lift the shell. If there is not enough adjustment left, you will need to buy and install new torsion bars. Not cheap, but doable.
Adding the air conditioner to the roof will, of course, add to the overall height of your TM. Depending on where you store it, this may or may not be a concern.
If you decide not to go through with the roof installation, there is a lot of info on this board about installing a new cabinet-mounted unit, which one to choose, how to control the air flow, etc. A SEARCH will turn it up - look especially for posts by HarveyRV.
Finally, this is a strange place to post your question. I will let it stand for a couple days, then move it to the Appliances section where it belongs.
Bill
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