I have to disagree with you on that. I have a Passport, made by Keystone. It is a 32 footer with two slides and is 7500 lbs loaded (on the scales) Takes the same amount of time to setup as an 18 footer. I paid 22,000 for it out the door. Not a lot of options because it is an Ultra light. I have seen pop ups that cost more than that.
I have owned a Class A, 5th Wheel and a pop up. The pop up always took the longest to set up and take down.
With the trailer I park, unhook, put down the jacks, hook up water, power, sewer and put the slides out done. Have to do that on every trailer. I have had it all over Washington, Oregon, Idaho, Yellowstone and some other spots. I have never had any problems getting into most sites.
You have to match the wheelbase of the truck with the length of the trailer. Having the 4 door long bed which weighs about the same as the trailer loaded keeps everything nice and stable even after I suffered a blowout going 60 mph.
3220 Bunkhouse