I saw a 5th with an up front kitchen that I liked but I wound up getting a front bedroom because I anyone with bad intentions is more likely to do their deed at night when people are sleeping and I figure I am more likely to hear anyone mucking around with my truck or the basement storage area if I am sleeping up front. The slide out bed has a window that allows me to see the port side of the rig without getting out of bed.
Having the living room in the rear gives me a view through the large rear window and a few smaller windows while I sit back and relax I like having windows that give me lots of sunlight in the living room, if the living room was up front there would be no front window and even if there was a window up front all I would have is a view of my truck. The bedroom is darker without all the windows the rear has but that is a good thing because I sometimes stop to take a daytime nap.
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One other thing about the front bedroom is that the bathroom is also in the front. If I pull over to the side of the road I can use the bathroom without opening any slide, I can take a nap at a rest stop without opening a slide but if I need to get to the rear I have to open a slide