This is just a story of my experience with "permanent" sites. Take from it what you please.
Our previous MH (2004 Sunseeker) which was on what we previously called a permanent site needed some insurance repairs. A tree branch fell on the roof, puncturing the rubber, underlayment, the AC unit and ultimately excessive water damage. It turned out to be an $8000 repair. The insurance agent asked the location of the motor home at time of damage. We replied at our permanent site. Her jaw nearly hit the desk. She asked if the MH had skirting, blocks or any permanently attached utilities. We truthfully answered no. She then stated the term we were looking for was our "seasonal" site. Any of these would make a camper permanent and therefore our policy was void. She then reasked the question and we gave the correct response. She nodded and smiled and said we would have the check within 2 weeks. (It was actually about ten days.) I now make a conscience effort to refer to our site for what it truly is. Seasonal.
IMO you would be OK to put on blocks if you didn't remove the tires. But then again, it won't be me writing the check if something goes bad. I would just suggest a quick phone call to the insurance company to verify all is well. Again, that is just my opinion.