I have on several occasions brought along a 8000BTU window air conditioner unit and setup on a board in the tent bed area we use for our daily catch all area. My 2KW Honda EU2000i runs it just fine.
We have the A/C sitting on a board over the mattress and then have the back of it sticking to the outside with the window flaps wrapped around the unit. It drains to the ground doing this and works great...
My 2KW Honda generator will not run my 13,500 BTU air conditioner at all so when I am off-grid I can bring along the 8000BTU unit and it works just fine...
A 5000 BTU A/C in a 30' TT? That should work about as well as whizzing into a stiff headwind. A 5K would struggle to cool a TT 1/2 that size in 95* heat; trust me, been there and tried that. Unless she sits directly in front of the A/C, she won't feel a thing from it.
The reason a 2000 watt generator won't run a 13,500 btu ac is that the ac draws about 2,000 to 2,100 watts (give or take a few) to start the compressor. This is close enough to the limit that manufacturing variations are enough that most generators and ace won't work but every now and then there will be one that will. Sort of a downhill-with-a-tailwind deal. But a 5,000 or 8,000 btu ac should work. Just don't count on being able to run anything else at the same time.
So, Mike G, you don't think it will help at all. I was hoping to bring the temps down 10 degrees or so. I would close off the front of the trailer and would be cooling 140 sq ft. I would also put reflectiix on the windows that the sun shines on which I already do. Have you tried an 8000 btu model?
Just ran the numbers and 140sq ft with poor insulation and a 10 degree Delta T only requires 4k BTUs so you should be good with an 8k (home based calculators probably assume better than r7 even when set to poor and you lose some effective capacity at such high ambient temperatures).