In Phoenix and last night had the first rainstorm in our new Landmark Rushmore. Woke up in the morning and had a small puddle of water on the entertainment center counter on the by the rear window (right side). Got it wiped up and went outside to look at the situation. Noticed the ladder attachments didn't look caulked very well. Went and picked up a nifty folding ladder but it started to rain again and the puddle quickly came back. I didn't think that much water could get through the ladder holes so quickly. Threw on the rain jacket and laid some tape across the top of the entire rear window. That stopped the water from running down the end cap and into the frameless window top. Viola!! No more leak. Have had several torrential downpours and still no water. Really bummed my rig got wet and such an important component (windows) was not caulked properly at the factory. Not sure if I should repair myself or call Heartland.