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I don't like to put anything under the tires that
will not cover the whole width of the tire. In addition I never,
ever block only one of the rear duels. I believe that when you put
a narrow board under a tire you cause damage to the basic structure
of the tire. If you weaken the steel belts in the tire the chance
of tire failure increases. So, if I have to raise the rear end and
need to use blocks to do that, I always put the same number of blocks
under each tire. Always.
An additional note. The rear tires of the MH must
always be in contact with something solid. Remember, it's the emergency
brake that keeps a MH from rolling, so never use blocks under the
jacks and raise the rear tires off the ground.
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