I have now owned my 1999 Marquis Jasper for one year and have seldom used the roof top AC.  I am planning an extended road trip during late July and August and after following the great advice I receive on this forum, I have decided to clean the three (3) roof top AC's, including the filters, before departing.  Removing the covers topside and cleaning what is on top the coach seems like a  breeze but I cant figure out how to access the filters from within the coach.  According to information I have gleaned from this forum, it appears that only way to access the filters is from within the coach.   Because this is a duct'd system, to do so, it appears that I must remove at least the wood panels, if not more, on the ceiling of the coach in the living room, bathroom and bedroom but that seems like a pretty major project to perform a regular maintenance function that requires more than one person.  Is there a short cut to access the filters or must I recruit some neighborhood muscle to accomplish this mission?  Heaven only knows when the last time any AC filters were cleaned.  I thought it best to ask before I start tearing things apart only to find out I am doing it wrong.  Thanks in advance for any advice.