I had the same problem, and based on suggestions from this forum, cleaned the area around the jacks where the cylinder goes up into the housing with some WD40 and some Q-tips. They now go up fast.
Seems all the road debris causes too much friction and the jacks don't retract.
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Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 20 years & 200,000+ miles
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