Mikey,
If I need to lift just one wheel, I put the jack under the leaf spring bolt plate. Even though this isn't the recommended way, it should cause no harm. Don't jack on the axle tube or place a jack stand there. It will bend.
If you need to lift the whole side, then use some big timbers and jack right on the frame in front and behind the tires. THIS is the recommended way for any jacking even for one wheel. You should use some kind of stand or timbers under the frame after jacking for safety if your going under or taking off a wheel for maint.
Remember, you need to raise the rear stabs, and its best to have the trailer on the truck and not the front jacks. They will equalize but its better on the truck.
Bill
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