Raise the car up to maximum height with floor jack, and set it on jack stands, with the jack stands at the furthest possible extremities of the suspension. That should get you very close to normal laden condition. Be careful to set the stands in a safe manner and not to damage any suspension components. Otherwise, you'll have to use a hoist with drive-up ramps instead of a 4 point hoist.
Mike Zeppieri Stage III+ 2+2
"A broken clock is right at least two times a day." -Tony Soprano