When only lifted half way the corners of the beds on our Dutchmen pop up would catch on the canvas. Tore the plastic of one of the windows and had to send it out for repair. Be careful and watch everything when closing up. Also, remember that there are no safety supports holding the roof up (at least on ours) when open only halfway, so if the lift cable breaks the roof slams down on your head.
2015 Starcraft Travel Star 299BHU Black Pearl Edition
2011 Jayco X23J (traded in)
2009 Ford F150 FX4 SuperCrew