Second starlink router for Gen 3

I move my Gen3 antenna & router/power supply from the house into the RV for trips. I would like to get a second router/power supply to leave in the RV & atached to a port that I can plug the antenna cable into from the outside. So:

1. Is the router paired with the antenna somehow? Does the antenna even know or care what Starlink router it is attached to?

2. Where can I buy just a router & power supply?

Thanks in advance for any help you can offer,

Dave