One other point of this repair.The trailing arm bushings need to be
pretensioned when installed.When the repair is done, and you lower the van
to the ground,the weight of the vehicle will cause the new bushing to be
twisted. This,by the amount the weight flexes the arm. Your new bushings
will always be stressed until the suspension travels the entire amount it
can move.Then the bushing is relaxed. You want the opposite. The bushing is
stressed when you hit a pot hole and relaxes when the suspension is back to
normal.To do this , complete your repair and lower the vehicle. All vehicle
weight needs to be on the wheels. Now,crawl under the van one last time and
loosen the bolts that attach the trailing arm to the frame.Dont mess up
your alignmen,but loosen the bolts up good. Bounce on the bumper a couple
times to release the bushing from its stressed, grip. It is now relaxed.
Retighten the trailing arm bolts,any you are done.The same pretensioning
goes for the front lower control arms weather they be sheet metal or cast
iorn.However, for your vanagon(that thing I see between all that rust)this
is a different story. When you hit your first pot hole , you will be
writing,asking about how to replace an entire wheel.Use that  blue Rustagon
for parts.