I had the same problem several weeks ago on vacation. I'm rolling down the highway and my "jacks down alarm" goes off. So I pull over to check my jacks and all three are up all the way. But the alarm is loud and driving me nuts. This is where my previous life as a pilot for 32 years became a asset. I unscrewed the control panel on the dash and disconnected it. Problem solved, no more alarm. When I get to the RV park I reconnect it and everything worked perfectly. When I leave the park, about 20 miles down the road the same thing happens again, I disconnect it again, and when I get home I reconnect it and it works perfectly. With the information I've read on the previous posts ( float in reservoir) I'm thinking my fluid is a little low. Driving in Italy is crazy, but would love to do what you're doing. Have a blast and enjoy the ride. BTW, I have a 2001 American Eagle with Power Gear Jacks.
Bob