Adam,

The hoses under the rear deck are drain hoses for the rear drain holes in your sunroof. The front 2 drain holes go down the pillars on either side of the windshield to the front fender/door jamb area. If you disconnect the rear hoses or if they are damaged, you will get a wet trunk! I like to flow check the drains every few years by putting a small amount of water in the trough around the sunroof when it it open. If all is well you will see water flowing through the rear hoses and out of the fender area fo rthe front hoses.

Brian