Hey Folks! In the planning stages...I have a F150 and am planning on getting a lightweight pop up overland truck camper. I am asking for any of those that are familiar or have one and am very interested in what your max height of a mattress is for the overhead bed sleeper portion? I contacted the AT Ovrlnd people and they said that 2.5" is the max for mattress....are you kidding me? That's not much cushioning at all if planning on sleeping in the thing longer than a weekend (which I hopefully plan on). Just wanted to get a first hand perspective on this. Thanks so much!