I asked our PDI guy this and he said always level first, then put slides out, as that is what he learned in his factory training from Forest River.
I've seen it both ways - some say level first, some say slide out first...(which is what prompted my question during the PDI)
2012 Flagstaff V-lite 30 WTBS
2011 Ford Expedition
4 kids and a hubby & never enough time to camp!
2011: 17 nights 2012: 26 nights 2013: 46 2014: 20 2015: 16