Like most RV manufacturers, TM used a number of different air conditioners over the years, and even within a given year. You need to figure out which one you have - your blue book will identify it, or you can find a tag on the unit - and then get the appropriate manual. If you don't have the manual, they are all available on line at the unit manufacturer's website.
Maybe start here fpr an earlier discussion of one of the units.
https://www.trailmanorowners.com/for...ight=drain+pan
Bill