Beautiful car indeed, wait until warmer weather before teying to remove stickers.
Airbag light, my 3 litre starts flashing when we have moved the drivers seat so I too need to check the connectors too. That said the reset procedure is in quick links and then downloads section so take a look and fix it for free
Assuming your remote locking is working as it should the alarm hron is behind the boot trim on drivers side. Remove boot aperture kick strip and then peel the aperture seal from the bottom around the top but no need to remove all the way. Remove lower rear most seatbelt mounting bolt, careful when you refit not to cross thread. Then the lower boot trim should pull away from the metal bodywork but again dont think it needs to be completely removed to see the horn near the seatbelt reel. People disconnect this when they can’t unlock car with the fob.
Sit back and enjoy the truck.