a friend of mine who has been RVing since '98 told me to always put the jacks down before the slideout. When leaving bring your slideout in before retracting your jacks. His theory is that if you put out your slideout first and then the jacks, the jack may tweak the frame of the RV and the slideout will not go in because the rails that the slideout rides on are not aligned. I've done it both ways and so far have not had a problem. Anyone know know what the mfg suggests?