There is a paid website (Trepp) that tracks CMBS data. Since commercial mortgage backed securities are essentially public debt, borrowers are required to report information about their properties back to the debt holders. As far as I can see this is probably the best source of nationwide property level data that exists for this industry. There is a lot of information like vacancy rates and rental rates (both show recessionary effects), but in my opinion, all of those more granular data points roll up into one primary indicator which is loan defaults. When I ran the data on this I found that loan defaults for MH parks were actually one of the highest ones for all of the commercial real estate sectors. Needless to say, I was very surprised to see this. I'm sorry I can't quote the exact numbers right now but it has been a few months since I was looking at this information.