Slide Binding Up

From one AF 1140 owner to another, your slide should work well both on the truck and when off the truck, assuming that your are relatively level. Your dealer, like so many of them, is blowing hot air. AF as well as many other RV manufacturers use full wall slide outs and if mounted properly they should work well. My guess is that you have some adjustments to make, and more than likely your dealer doesnt know how to do them. You should not have to jack things up and down to make a slide out work properly. Mine has been used extensively over the past 5 1/2 years with no problems. The slide out on my previous motorhome was twice as long as my AF slide out and it too always worked perfectly. If your slide worked well previously, but not now, then something got moved and needs to be readjusted.