Based on the wholesale shipment numbers you can get at RVIA, popups have stayed roughly the same since 2008. Around 12000 average or so units shipped per year. Popups are included in the "folding camping trailer" category which also includes A frames like A liner, non conventional popups like Livin Lite, and most likely Trailmanor also. So its not all that many when you take into account 12000 units shipped to the entire US and Canada. You need a membership to get the years prior to 2008. The trend I see as far as entry level is manufacturers have been flooding the market with these 26 to 30 foot stick and tin trailers that can be pulled off the lot for as low as 15K. My 2013 Keystone HTT laminated trailer is nothing special, but its put together way better than some of these newer stick and tin jobs I have had a chance to look at in detail. Then a dealer will put first time owners in one of those trailers with a 7 or up to a 10 year note making the payment small. The trailer will most likely be falling apart long before its paid off. I wont mention brands / models but every manufacturer has been pumping those out. Its easy to see why a young couple with a new family would walk right on by a popup for 8 to 10 K when for 5K more they can have a 26' bunkhouse with the payment spread out. It also explains why sometimes I need to beat my head off the steering wheel when I see what some people are using to tow those trailers.