For an eleven year old coach you had quiet a lot of bushing left. In 2011 my 2006 coach had empty mounting frames and what looked like black slag. Replaced with blue ploy bushings I got from an eBay seller. At 13 years the fronts still look OK as of last week.
https://www.ebay.com/itm/Ford-F53-Cl...pe!23601!US!-1