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Old 05-07-2012, 08:03 AM   #15
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Originally Posted by bigdomino View Post
I think Monaco and its sister brands are the only ones with the 3 jack system.
Maybe it's because they don't use a metal window frame that's part of the chassis.
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Old 05-07-2012, 03:22 PM   #16
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on 4 jack systems, the two front ones are connected together, so there is no possibility of torqueing the frame. The two rear jacks are individually controlled. To tilt from side to side, one or the other rear jacks are raised or lowered. To tilt from back to front, you can raise or lower either the front or back jacks.

The 3 jack and 4 jack systems are functionally equivalent. Using a single front jack may save some complexity, but will require a heavier jack.
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Old 05-07-2012, 04:18 PM   #17
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I had an older gas Tiffin and number of years ago and it had the 4 jacks. I could regulate the two front jacks independently. So you could torque the chassis if you were not careful.

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Old 05-08-2012, 10:33 PM   #18
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Our friend's 4 jack 2000 Alpine is a lot more stable when leveled up than our 3 jack Knight. If we are low in the front, we get level, but the coach still rocks a bit, even with the rear jacks planted solidly.
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Old 05-08-2012, 10:41 PM   #19
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I'm glad it is only the front that rocks........my king bed is over the rear two jacks. deSanford
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Old 05-09-2012, 12:24 AM   #20
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The newer four jack systems will only allow you to jack two jacks at a time to avoid the twisting of the frame.
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Old 05-11-2012, 07:54 AM   #21
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Originally Posted by gg View Post
Has a new class A coach been made since 2009 with 3 jacks? I have not seen one. All the New ones I have seen have jacks with dual action cylinder eliminating the spring for return.

So I would guess-

The Manufacture must have determined the 4 jack system is superior and cost effective or they would be using 3 jacks.

my 2 cents
My 2011 Monaco has a 3 jack system.
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