Jack at the rear use the diff,
at the front the crossmember as it is one of the stronger points, otherwise use two trolley jacks and under the lower control arms on the front and these are cast and rather strong...
but do NOT put the jack anywhere near the steering rack, sway bar, sump or gear box as the result may cost more than an arm and a leg...
To be quite honest I would use the jack and then place axle stands underneath for more even distribution, remember use the right tool for the right job.