This thread may have alternative Moog parts compatible with your van. Please note, tapatalk posted whole note, I meant to share link. Nonetheless, part links below.
https://r.tapatalk.com/shareLink?url...5&share_type=t
Threads found on caster adjustment on this forum
This one talks about getting shofter arms
http://www.sportsmobileforum.com/for...lved-8390.html
This one talks about getting caster really high (6-7). Very informative read, although the poster has high lift (6")
http://www.sportsmobileforum.com/for...r-19400-3.html
Also, this is a very long but worthwhile read (on another forum). The thread is mostly about steering stabilizer (adapted off an E450), but it talks about increasing caster to 5% for maximum comfort (e.g. post #508 and beyond)
https://www.ford-trucks.com/forums/1...ng-fix-34.html
post #517: Alignment bushings that might be needed to help with increasing caster: NAPA 158986 or Moog 8986 or Ingalls 594s
post #525: caster does not affect tire wear. Only camber and toe
https://www.ford-trucks.com/forums/1...reversing.html
Quote:
Having too little positive caster will manifest itself as "loose steering" and "wandering" at highway speeds.
Ford ships the E series with +3 to +4 degrees of caster. You want to add 2 degrees to have +5 to +6 degrees. Google "E350 Handling" or "E350 Caster" for lots of info.
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Estimating caster w/o going to the shop
https://www.ford-trucks.com/forums/1...al-camera.html
At this point I am somewhat "sold" on the caster idea, provided all other parts are in good shape.
Other link
http://www.rvforum.net/SMF_forum/ind...?topic=78950.0
Couldn't find on Ingalls, but found recommended Moog K8986 parts on amazon. Ordered them and will bring them to alignment shop. Can always return if not needed.
https://www.amazon.com/gp/product/B000C560IE/