There's a FaceBook group dedicated to Gulfstream owners. I've had great luck getting answers to many questions there! https://www.facebook.com/groups/423524024415896
I have a 2007 GS TourMaster 40B with the MBE 906 engine.
As for your awning question, I didn't have that particular manual, so that's great! I did find there is a safety cut off that engages with the engine is running. (Found that out by trial and error .. mostly error..)
If you search this forum, you'll find a wealth of information, including some of the hardest, such as various wiring diagrams, info on hydraulics, etc..
Good luck! I know I've enjoyed my rig for some time!