AAAAnd the winner is...  Tom Buese!

Mind you, he actually measured the area in his van and
knows the density of gravel.  His guess, 1690 lbs, was
just 30lbs from the actual weight of 1720 lbs.

For his efforts, Tom will be recieving a slightly crumpled
copy of "Harry Potter and the Goblet of Budweiser"
as soon as I can find it under the gravel.

Thanks for playing!

tabe