Smaller bunk house trailer recommendations

My wife and I are going down the same road as you are starting first looking at 18 ft lite campers and slowly moving up to 21-23 ft models because of layout and price. Our revelation on trailer length came at a dealer that showed us a nice 21 ft Areolite trailer. He also had a 22 ft Dutchman 5th wheel that he showed us next. Night and day difference in size and amenities inside. So not quite believing him about the 5th being only 22 ft I said that it looked much bigger than 1 ft larger than the trailer. He then explained that the trailer was measured bumper to hitch and probably had about 18 ft of trailer space and that the 5th was measured bumper to hitch pin but since the hitch pin is mounted right at the very front of the trailer a 22 ft 5th wheel is about the same as a 24 ft trailer. There are tons of other differences but after seeing the inside difference we have been looking at 22-24 ft trailers. We have a campground at the gun club I belong to and last weekend a friend and I measured several campers for box length and tongue length and wrote down the model numbers. When I got home I looked up the camper by model and checked the listed length. Every one of them was bumper to hitch for published length. Average hitch to front of trailer was 40 inches so published lengths were 3-4 ft longer than actual usable trailer length.