I've attached some pictures. Here is a quick summary of install:
1. Removed trim that surrounds Soundstream (be careful as you will reuse)
2. Remove four corner screws that mount Soundstream to double din frame in dash
3. Remove and disconnect antenna, camera video feed, GPS antenna, dash usb input, and wiring harness.
4. Cut all wires for old wiring harness adapter..
5. Match and splice wires to new harness adapter (They are labeled on the Jayco wiring...take your time and get this right)
6. Move original mounting frame from Soundstream head unit and put the Boss single din head unit into the top portion reusing two screws that came off of old unit.
7. Wire video into Boss Rear Camera input
8. Plug radio antenna and Carplay USB into Boss head unit
9. Leave GPS/Sirius antenna unconnected (Boss unit doesn't have these features)
10.Slide the head unit back into the dash (I had to force mine gently as the screws are a little wider (could be fixed with FHS screws, but I didn't have any on hand).
11. Mount the Din tray adapter using Gorilla double stick tape (I put some on the bottom of the double din frame
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
12. Matched the included din tray adapter trim to ensure no gaps visible
13. Put the original double din trim back on.
14. Reset the Boss head unit
15. Turn on Boss head unit and adjust height and tilt to make visible during driving.
16. Crack open a beer and ask why they don't make all radio head units to the same connector standard.