I owned a Palomino product once upon a time, it was a hard sided pop up. I found that the construction quality of the product was very good so I would agree with you. The Puma travel trailer that you are looking at seems like it will be well suited for family use if that's your intent.
The reasons why you can't find a Puma 25RKSS are only limited by your ability to enter those numbers into a search engine. I expect that you will find one. If there aren't any used ones you can be sure that the 1st time owners are keeping their rigs!