Sounds like the chassis/slide is tweaked a little and wedged in. Have you tried re leveling coach? Or retracting all levelers? Or putting slide back out. If you can it would be better all the way out and supported by the side wall when leveling/retracting. Slide outs are most vulnerable when not all the way out or in.
Oops, just reread your post and you have tried to extend. At this point I would just get the coach level and then retry.
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2018 DX3 37RB - 2017 Jeep GC Summit towed
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