fyi I just de-installed a SL "RV system" at my CA property and replaced it with an address-dedicated SL system. Here were notable discoveries:
1. Due to earlier confusion/problems/bugs of iPhone communicating with more than one SL, I deleted the SL app before proceeding. Despite a warning that the app "and all data" would be deleted, I learned the data was not deleted. Upon reinstalling the newly downloaded "fresh" SL app-- it was still populated with my old data.
2. It took some fighting, and multiple tries using the "Setup Another Starlink" option, but I finally got the address-dedicated system installed. Most of the trouble was getting it into bypass mode, which it did not want to allow me to do. And after I finally convinced it to let me try, I repeatedly got "Error During Save" messages. (I suspect it needed to finish some of its bootup processes as it later let me save.)
3. At first, I swapped only the modem/router. I figured the outside antenna didn't need to be changed. But after the swap, I saw a message "Outside Service Address" at dishy.starlink.com. I powered down, swapped the antenna, and that message went away. So the modem/router and antenna seemed to need to stay together as a matched set.
While I was waiting for bootup, I looked around at the new questions and answers on the SL app. Now, in response to the question as to whether there are any data caps, the answer is "not at this time."
The data cap answer is somewhat alarming to me-- I'm pretty sure it used to say "No." I hope there are no rude data cap "surprises" in the future ....