Friday, Sep 12, 2014 at 09:23
If you are going to use a trolly jack on other than smooth hard surfaces, you need to have a fairly large board that all the wheels can ride on...AND... you need to have a fairly flat section of ground prepared to place that board on.
The load rating and the mechainical reliability of the jack rely on the weight being supported more or less evenly on all 4 wheels.
The other issue is those wheels.....on uneven ground or with sideways forces they can move and skew arround.
I have a series of trolly jacks since Kmart first braught out a trolly jack that mortals could afford back in the early 80s.
My current unit is a full sized garrage jack.
I have never had the luxury of always being able to use them on a flat concrete floor.
I have used the various jacks many times on a board...with care this can be done safely.
But its not something I would try on uneven ground or on soft ground.
it also must be understood that trolly jacks produce quite high point loadings due to being supported by 4 wheels and not a flat wide base.
OH yeh remember these wheels.....if you jack up a vehicle that is not properly chocked.....the whole she bang can take off at speed on the wheels of the jack.
I have had
the wheels put big dints in the board
the board flex sufficienty for the frame to botton on the now curved board
the jack creep off the side of the board
Trolly jacks are a great thing....lots of caravanners carry them.....even away from a garrage floor.....but not away from something that approximates a hard flat surface.
cheers
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