Have you thought about checking with the hospital (maybe a discharge planner) about your problem? I retired from U.C. Davis Medical Center in Sacramento, and besides having a full Ronald McDonald house, we also had a Kiwanis house on campus (we have a lot of land - it is the former state fair grounds) with about 15 RV spaces. Now these spaces are dedicated to families of patients, but maybe some accommodation could be made for you. Being a teaching hospital we also had interns and residents doing their training there, and I remember 1 Class A RV that was fulltime in one of the vast employee parking lots over most of a year with the generator going during the day sometimes. Maybe one of the staff could let you stay in their personal driveway.
I checked Nashville Craig's list for you and did not find any trailer/RV park listings where I see them in the Craig's Lists here out West, under "Parking/Storage". There were a lot of RV storage listings.
Good luck, and I hope it works out for you.
Bill Knight CBET