Welcome to the Forums!
I am an SIU-C alumni as well, and live 18 miles from campus today. There was something of an uproar over the condition of rental properties being offered to students a few years ago that spurred a number of changes in county zoning laws as well as zoning within the city of Carbondale. My understanding is that these changes have made it more difficult to setup RVs in mobile home parks. I am not familiar with the Jackson county (home to Carbondale), but Union county (next to the South) real estate tax laws have changed such that some who once rented ground to the owners of mobile homes no longer do so as a result of changes in the real estate tax code that make the land owner responsible for the annual taxes on any mobile homes parked on his/her ground rather than the owner of the mobile home itself.
Something to keep in mind as well is that we do have four to six weeks each winter where temperatures are such that you could expect to use several hundred dollars worth of propane to run your Airstream's furnace. Even with the furnace running, you could expect issues keeping your city water supply from freezing as well as the waste water drain.
Good luck with your investigation!
P.S.: I am aware of only one and possibly two RV parks within an hours drive of Carbondale that might be open year round -- most parks in this area close sometime in November.
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)