You don't have a wheelbarrow? As someone who shovels manure for a living, I can tell you that a wheel barrow pwns lugging buckets full of rocks nine times out of ten. 8^D Use the wheel barrow to fill a trailer or the tractor's bucket with your clean gravel, then when it's full, the tractor can come back, get hitched to the bucket or trailer, and cart the load off to your foundation.

At least you have rain and the grass is growing.