Unless you changed them, the lifts were sized for a "standard" mattress, not the lightweight Sleep Number. You may be fine but if not, it's perfectly OK to replace them with heavier ones!
We replaced the original mattress with a Sleep Number and had to replace the struts with lighter ones!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD