one thing i've found very useful with jackstands ... cut some 1-inch
(25mm) thick marine plywood (so it doesn't come unglued when/if it
gets wet) into a square at least a couple of inches wider on each side
than the jackstand. then put the square of plywood under the
jackstand. helps gain a little height, but mostly it keeps the base of
the jackstand from sinking into the dirt/gravel/asphalt driveway. or
damaging the concrete driveway, if you're lucky enough to have that
sort of driveway. :)

most of the time, you can find remnants or scraps at home-depot or
lowe's or somewhere ... they've sold 1/2 a sheet and have few
customers for the leftovers, so they'll sell it cheap. they even cut
it up for me. :)

joel