Newbie needing beginners advice

Thanks “emcvay” —- I hadn’t thought about size of bathroom (6’2” 300#) are all bathrooms the same size. I’ve been looking at Members rigs- that helps. Is it just the picture angle- the tie downs look awfully close to side of bed/painted surfaces. My truck came with a Reese 5th wheel hitch which I have taken out leaving the rails. I will need to build a base for the tc floor to sit on? Does the camper sit all the way down on bed rails? And if so what kind of protection for top of rails? Sorry for all the questions. Thanks