Yes, it got me scared for a moment...
I did some research and I found a lot of chassis rust related complaints on this and on other forum sites. Looks like the shoddy rust protection is an industry disease, not just Jayco and the even more shoddy road salt cleaning after transport is also typical for many dealerships.
Let's see if I can get any feedback from the dealer or Jayco customer service. I am already hesitant to let the dealer fix the rust, assuming they will just spray over the rust with black rattle can paint. There are reports regarding that as well.
Not a good start of my motorhome adventure