I personally installed Bilsteins both front and rear on my 1994 Dodge Roadtrek versatile 190.
I can understand your mechanic not wanting to tackle the rears. The problem is that the upper shock bolt nuts are so close to the shower pan that there is very little room to maneuver. You would have to have world's tiniest and longest fingers to get in there manually. To make things easier, I used a 1 1/2" hole-saw and from the interior, drilled holes through the side of the shower pan centred directly over the shock bolt nut. OK, how do you determine exactly where the centre of the shock nut is located? I did my best to carefully measure, from underneath the van, where the centre of the shock nut is located on the side of the shower pan. Next I transferred these measurements to the interior of the shower pan (taking into account the thickness of the shower pan wall). Even so, to be sure of exact placement, I drilled a 1/2" starter hole to see precisely where the 1 1/2" hole would have to be located. Drill the 1 1/2" hole, use a long socket and remove the shock nut. You can take it from here. Plug the 1 1/2" hole with a hole plug and use sealer to make the hole waterproof.
My Roadtrek is a Versatile and the shower pan may differ from your Popular. If there is resistance in removing the nut, things really get difficult. I used to live and had my Roadtrek in Ontario and know that seized bolts and nuts can be a problem. Take the advice of others and soak the upper shock bolt/nut over several days to make removal as problem free as possible.
I don't have to remind you that this is not the time of year to be doing this outside in Ontario.
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