Thanks. I don't think the crossbar assembly itself could be the culprit. I agree about using a marine sealant, the problem is where to apply it, and how.
On the 2022 model, I noticed it has cover/porthole about a foot behind the rear crossbar on each side. They look factory installed, which was a surprise to me. Do Getaways come like this now? Anyway, I can probably use that to apply sealant (probalby 3M 5200) on the inside of the crossbar tube on this boat. I might likewise cut and install an access port on the 2003 model.
I am first going to attempt a lower effort fix by turning each boat on its side, attaching a shop vacuum to the drain hole, and applying liquid marine caulk
https://www.amazon.com/dp/B0000AZ8OG?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1&psc=1 around the edge of the crossbar - hoping that gravity and the vacuum will draw it wherever it's needed. On the older getaway, since I don't care as much about the aesthetics and there is no possibility of a warranty claim, I might use the 5200 around the crossbar/hall edge as well (after the caulk cures).