I swear they 'know'...
Our
Casita SD17 was without issue during the years we owned it..... until this spring.
Power converter failed, and was replaced
LP and CO detector failed, and was replaced
Maxxfan cover lift gearbox shattered, and was replaced.
And when hooking up in the evening of the 26th for an early morning departure to deliver it to the new owner, the electric power tongue jack went on strike. That was completely stripped, cleaned, re-greased and reassembled.
Our new camper (not molded FG) is now in our drive.