The extra counter space makes sense. Why no toilet? We camped out of a PU for 17 years when the kids were young and loved every minute. We were young, camped during the warm months of summer and taught our daughters about "roughing" it, at least to some degree. Now that we are older and camp 3 seasons each year, the inside facilities make lots of sense.
I guess it is how you want to camp and whether you are willing to pay extra for features you don't plan on using. I do like the idea of getting some extra counter space although at quite the cost.
Thanks for the tip on the Coleman Utah. I do seem to remember seeing some of these years back when they came out. The slide really opens up the inside of the trailer.