I'm looking at a 2003 Rubicon. It is in fantastic shape - inside and out. However there is some rust underneath. Take a look at the pictures and let me know what you think. It was a New York resident for the first 4 yrs so I'm sure the salt help this issue.
Often the worst rust is from the inside out. Reach into the holes in the frame and see if you feel rust chunks. If there is, you should also be able to get a feel on how much has rusted away. The exterior stuff you show isn't bad.
1999 TJ Sport
2010 XK Limited 5.7
That looks about the same as my '06 LJ that spent most of its time in VT. The worst rust I could find was on the frame where the skid plate mates to the frame rails. The salt from the road must get in there and no wash away.
If you get it, I'd drop the skid and check for rust.