Anywhere under the front chassis frame or the 2 outriggers that the bonnet bolts to will do. I usually jack it up under the centre of the chassis rail and put an axlestand under each outrigger but if you do make sure the stands are far enough back that the bonnet frame doesn't hit them. Also, be careful with a small jack especially if you use a bit of wood as it can slip off the chassis rail.

JimHearne