For 2018, the fixed glass front window is now the standard window. We can almost guarantee that a slider window will let water into your camper during rain. But you’ve still got three choices on that front camper window. The slider window is popular but if you are driving into a heavy rain storm, the gutters where the glass slides, can fill with water faster than the weep holes can drain so when the gutters fill up, the forward motion of the truck pushes the water into the camper. We tell everyone to put towels down if they are driving in rain. The front window should not leak otherwise Your other option is a fixed glass window. Same size, but no chance for a drip or a leak. Third option is no glass at all.