I have a set of the "jack-in-a-box" stabilizers that I used on my former Sunnybrook 14' LR slide. It became too much of a hassle to put them in to mess with them for 2-week stays. I have heard others say that you should be careful that the trailer might settle and the stabilizers not, causing an upward leverage on the slide that might be damaging. If there was going to be damage caused by the weight of the slide, the mfgs would do something about it due to warranty issues--I haven't seen ANY slides with factory stabilizers, so if they don't think it is necessary to avoid warranty issues, then they probably aren't needed at all.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired