Our Keystone Bullet had a significant leak on the front of the slide during a heavy 2 day rain storm. This was only our 2nd trip with a nearly new trailer but we found water running into the slide and along the floor into the front bedroom. I checked outside and the seals seemed fine, when I checked inside I noticed that the front slide pulley mounting block had pulled away from the wall and water was running in behind the plate and down to the floor. The unit was returned to the dealer for warranty repairs for what they said was an manufacturing defect. They put in longer screws and did a pressure test for water leakage. Two months later the plate pulled away a second time. This time the plate was replaced and additional mounting screws were added; it now seems to operate fine but we have not encountered another rainstorm like the one that led to the discovery of the mounting plate issue. I have considered adding a slide awning to protect the top of the slide but have not done so yet. I don't know of any drain holes in the bottom of the slide. The seals should prevent rain from entering during a storm. You may need another rain to determine where and how water is entering your unit. It is important to keep the inside floor free from water leaks because water will lead to breakdown and failure of the floor material, leading to soft spots. If the water was coming from another source such as leaking water lines you would notice water rain or shine. Check your seals and bring the unit in for a pressure water test if you continue to have problems.
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