I would consider Airlift or Monroe air shocks for the van. You did nit say what kind of van and we assume you are talking about it and not the rear of the trailer.
If you have a 1986 Scamp
is probably a 2500 lb AL-KO unit and is most likely dead as well and is riding low.
I replaced mine with a 3000 lb Flexiride unit and it has adjustable trailing arms so that the ride height can be adjusted. My 1986 was sagging a good bit and I wanted the adjustability. The brakes
were 7" and 4 bolt hubs. The later axles with brakes
are 10" and 5 bolt driving a change in wheels and tires
from 13" to 14" (remember the adjustability?)
Let us be sure what end you are asking about.