The results are in, I experimented with the 8k window unit and did a final installation. Way too much time and effort into it, however I do not play golf or fish.
The 8k unit sitting in full sun on a 95° day with 68% humidity in Florida will keep my 21 foot Toyota motorhome comfortable.
With an explanation. With the AC going the inside does not exceed 78° I live in Florida and keep the AC in the house set at 80° during the day. Any cooler and I do not want to go outside any higher and the humidity rises to an uncomfortable level.
I do not know what the actual humidity reading is in the Toy but it is comfortable. I am also experimenting with some foam window covers which may help.
Jim