We had 3 fifths, two with middle kitchen one with rear kitchen. Honestly, rear kitchen. offer great utilization of space, particularly in smaller rig and DW like the fact that she had that area "to herself" when preparing the food and didn't have to toss everyone out because they were underfoot. The down side is that it is the worst place for things like dishes, pots, utensils, food stuff, etc. Every time you go over the bump or a ditch that motion is duplicated in the rear kitchen. Storing things properly so they don't fly all over is a real challenge and you have to come up with proper containers for everything back there.
Size of the rig doesn't matter anymore, most of the recently built campgrounds can accommodate any humongous rig you might buy. Some of the older and smaller campgrounds can be a "challenge", but that "challenge" is commensurate with your backing skills. We've been going to this old campground in Port St. Lucie Florida for couple of decades and I always draw a crowd when I arrive. They want to see if I can do it.
That's a 40 footer I backed into that slot, with that Volvo semi, from a blind side. I told the guy with the pickup he didn't have to move it.