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Old 09-16-2012, 09:40 AM   #29
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Location: Reno, Nevada
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Originally Posted by Wolfpack Fan View Post
Maybe on some Nationals. The rear jacks on our Dolphin will go down far enough the lift the entire rear in the air.
I found this out when we were returning from Sturgis this year and I had to unexpectedly buy 4 new tires for the rear. The tire shop didn't have capable jacks, so the mh jacks got the tires airborne then jack stands and chock blocks kept it safe.

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2005 National Dolphin 34'
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Old 09-16-2012, 10:41 AM   #30
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Originally Posted by Gary RVRoamer View Post
And how does the coach roll with 3 or 4 jacks pressed into the ground with a total force of 14,000-35,000 lbs? I can maybe see it if they are the kick-down (knee action) type of jack rather than a straight-down hydraulic ram, but otherwise it ain't gonna roll anywhere.

I am going to answer this one.

The following graphic represents a Jack with both rear and at least one front wheel in good contact with the ground |

The following graphic represents that same jack if one of the rear wheels is off the ground thus disabling the parking brake and a good size gust of wind pushes the coach either foreward or backward \

Does this answer your question:

The only issue I know of with only 3 jacks on the ground is the rig will wobble more as you move around in it. The 4th jack adds side to side stability.

Wheels, however, SEE above

Note that the same grapics, from a different viewing angle, apply if BOTH front wheels come off the ground and the wind gust hits from the side.

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