I am not going to write a long install guide, but those wanting tips and tricks are free to message or ask on this thread.
The Jupiter 3 is in the carport right now and won't be in the sun for a while, but the sensor definitely works and runs the AIR 8 based on the temperature at the control panel.
Truth be told, I haven't had much of a problem with the AC. We have taken several trips and the last was HOT in the afternoon (mid-90s). Our AIR8 kept up with a small fan to move air around inside. Now it should work without the little fan. (Having our new homemade awning definitely helped too.)
One other small jury-rig: I have this old black foam chair cushion in the back of the truck. After setting up, I wedge it between the ground and the tail of the camper so that it forms a partition between the AC inflow and outflow. Not optimal, but it's not noticeable and maybe that's why I'm getting decent results.