I had that happen on our 2000 DSDP on FL chassis. Turned out the hydraulic system needed flushing and new fluid installed. It quit in the middle of a turn off the freeway into city traffic. Had to steer the rig though a 90° turn in a tunnel. Used both lanes and car drivers weren't too happy about it. Finally found a wide spot to pull over but it was a bad 2+ mile drive in city traffic to get there!
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey