In my experience PUPS have become just as accessorize as TTs. Water pumps, stove/ovens, microwaves, heaters, air conditioners, televisions, refrigerators, brakes and slide outs.
All these conveniences cost.
My late 90's PUP had a small frig, two burner stove and hand pump with no battery for the 12 volt lights.
I suspect PUPs are like tents. They still appeal to a certain market.
I am curious why you re-caulk your TT every year. I have never had to do more than check ours in the spring and add a dab once in a while.
Take care