[wingnut60]

Need to know more about your type of Morryde suspension--do you have leaf springs or not? From your note of zerks, I suspect you may have the Morryde RE suspension--Rubber Enhanced--in the center section. But again, there are a couple different RE units.
If you have leaf springs, you can use a plastic ramp. If no leaf springs, NO.
If you use a jack, choose a bottle jack that will fit under the leaf spring mount--if you lift o the axle housing, you take a chance of bending the axle.