trail-explorer wrote:
..and when using stacks of lumber under the jack, set them so the lumber length runs parallel to the trailer, not perpendicular like shown near the top of this thread.
Why? Movement of the trailer can totally topple that stack of lumber.
Normally your argument might have merit but not in this case. What you seem to be missing is that
there is no trailer movement. The stack isn't subject to
any force that would cause it to shift forward since the tires themselves are firmly chocked in place using the weight of the trailer itself bearing down on the wheel pads. I've been parking trailers for 16 years now using one variation or another of this same technique to secure our trailer on our significantly sloped driveway - there is
no force on that stack that would cause it to shift in any way.