Installed a flush kit in a 2008 Coachmen years back, since then all my RVs have come with a factory flush. On the Coachmen, couldn't access where it should have gone so put it on the end of the tank which was closer to the drain end. Found it did not really do the job as it should. Found that it was better to flush by filling a large water container used for camping and dumping it into the toilet.
The 2007 owner's manuals are available for download from the Thor site.
https://www.thormotorcoach.com/owners/owners-manual/
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