The drain holes are on the outside corners (front, IIRC) of the A/C unit and a couple inches in from the housing edges, and the water drains out along the roof and down the walls. If you're thinking about the internal drain tubes that run down/inside the walls and run out under the coach, '05 Dips don't have them.
I should clarify that to say "...unless someone did it themselves". Talked to a fellow-camper awhile back that said he was getting ready to do a complete refurb on his interior and planned to add them in at that time. Doesn't seem like it'd be difficult once you can access the ceiling/wall interiors, and would be nice to have.
HTH
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