We have the Sleep Number Camping World Edition in the King (72 X 80) size. We've had it for several years and really do like it but decided a year ago to add a 2" topper to it. The CW Edition compares to the old 4000 Sleep Number with about a 2" foam under the top cover. We added our 2 inches right on top of it under the zipped cover.
Our pump was replaced a couple years ago under warranty. No issue with the pump but the wired remote had lost some display quality and we couldn't read the numbers. The replacement was the newer wireless and therefore a new pump had to be used as well.
Our pump is under the mattress platform and the fill tubes come up through holes I drilled. The power cord comes out from under and plugs into the outlet on the bed platform. Very convenient and we never have to unplug it.
One thing to remember when traveling into higher altitudes, deflate the chambers or you will see very large footballs under your bedding.