I have a 2013 Cruiser Aire 28RL 5th wheel. When I open my slide all the way there is approximately a 3/4"-1' space between the inside lip on the floor of my living room/kitchen slide and the floor of the trailer. This space was not evident when I first purchase the 5th. Is this space normal or is there an adjustment needed on the slide. If an adjustment is needed, how is it done.