Haven't had a spot of bother with mine (3.5t) great to couple if you rotate the cup back a little at he right height it drops on by itself, I have been told by Jayco to bring mine in for a free replacement one with heavier construction unit under warranty. If you lift the release lever first then wind up the jockey wheel it should pop straight out unless it is damaged somehow.
The adjustment should be set from the factory.
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Brian & Nada retired and > "Ready to live the Dream" Live in the Shire!
76 series V8 Landcrab with Jayco Starcraft Outback Poptop