Originally Posted by Gary RVRoamer
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.