While towing level on reasonably level ground there should be no problem putting the slides out. I have done that many times. As to why the landing gear is also moving I have no idea, but I suspect a faulty valve as previously stated. Fortunately my unit has aftermarket 6 point level up and it is totally separate from the slide system with its own pump/tank and lines etc.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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