I bought a 5000 a few years ago for my TT - no roof air. In the heat of the summer it was unbearable at night in there.
Although it did blow enough cool to almost take some heat out of a bowl of soup, I found it to be very ineffective. I pulled a jalousie window apart and rigged it there where I was set up for a couple weeks.
Instead of sweltering at 93, I sweltered at 89 instead. I realize it won't cool a whole TT but I thought it would at least make it bearable in there. I had to run it until nearly midnight before I could sleep.
I think mine is rated at 575 watts.
But! Having said all that, I think the AC's of today are no where near as good as those of yesteryear. In my stick house I have a 12000 in my bedroom. It is a very old unit and was well used when I bought it. It does an amazing job of cooling. I leave the bedroom door open with a fan and it cools one whole end of my house.
I have a nearly new 12000 in my kitchen. It will not even cool the kitchen down very much, much less any of the adjoining rooms. It is very poor at cooling even though rated for 12K BTU. It is less than half as effective as my old one.
I have a very old 8000 in my living room. I bought it new in 76. It still works after all these years and works very well. It cools the living room down very well, much better than the near new 12000 does the kitchen, 1/3 the size of a room.
So I really think the new AC units of today are very poor compared to old ones.