Cat and I saw a 45' Dutch Star last fall that had 6 roof airs on it.
Let's see, 45 divided by 6 = 7.5' per A/C
So using that we can surmise that 26 divided by 7.5 =3.4666666666666666666666666666667 A/C's.
So now we can round it up, since obviously the Dutch Star, being more expensive has better insulation
We'll call it 4 roof airs.
That should allow you to keep the temperature about 34° in Death Valley in July.
It'll also help keep the beer a lot cooler so you don't have to work the fridge so hard.
Of course, you'l probably need 2 12.5 KW diesel gensets, but Hey, who's counting!

Dallas