Put the trolley jack under the front main crossmember first, using a piece of timber between the jack and the chassis. Jack the vehicle up and place on the stands, which should be positioned under the rear lower control arm support, where it is bolted to the chassis.
Place the trolley jack under the differential centre (using the timber again), with the jack handle off to the left (exhaust) side of the vehicle. Under the spare wheel well and it'll be very hard to move the jack handle and...