I tried a jack for a slide out on a trailer years ago thinking it would help with stability. It didn't.
The problem is if you forget the jack is there and lower your front end, goodbye slideout.
So my thought is it's a problem waiting to happen.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS