Might want to look at this http://www.airforums.com/forums/f252...sic-47113.html
I just worked on mine a few weeks ago and I'm kinda willing to bet that some of your issues MIGHT be related to the slide dragging real hard on a seal, like the bottom one. I just worked on mine based on Airslide's write up and I had it drag for a minute until I saw some drag on a seal, raised it up to get the slide floating in the seals rather than dragging on one.
Spend some time under it and see how it works, also you'll be able to see the manual release and how to extend/retract if it needs it.
I think the slide is a special trailer, get it right and enjoy it.