5 gallons - Holy Sh#t!!! That is a lot of fluid. Hopefully, you changed the filter too.
If I remember correctly, the tranny fluid isn't due until 60K. In my '01 2WD X, I waited until I had 60K on the truck, and then I did a drain and fill including the tranny filter. I don't remember having any trouble getting at the bolts on the pan, though.
On the '06 XOR, I did a drain and fill at 25K, and will probably change the filter next year (approx. 50K).