All RV's come with gaping holes to let unwanted outside air in.
1. Close off the laundry chute with foam insulation board
2. Close off air circulation into the cargo areas. (Lots of places where that happens.)
3. Seal up every crack and crevice you can find with "Great Stuff"... this is an all day project.
4. Get some of those "vent cushion" things. They work!
5. Keep unwanted sunlight (and heat) from coming into the trailer.
6. Try to park on a shaded site.
7. Keep your roof clean (as in reflective shiny white)
8. Shower at the bath house to keep humidity down.
9. Cook outside in the heat as much as you can stand it.
By making these mods we are able to stay cool with a 13500 BTU unit in a 30ft 5th wheel in the Georgia heat. Remember your a/c will only drop the internal temp about 20 degrees relative to outside. It just gets real inefficient about 95 deg.
Cool is relative.
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2008 (or is it 2009?) Rockwood 8280SS - 2007 F-150
Lot's of mostly Kenwood radios