I know that Susan's friends need and really want to keep hope alive but as many have pointed out, IMO justice for Susan will come when she is found and I think the key to finding her is not necessarily having HER face out there, but rather, the face of josh and a photo of his van. Putting such a poster at truck stops, in both English and Spanish may be helpful, or even on a huge sign near a freeway, or one or two, leading out of town.
There may have been someone, late at night, who saw something and just needs their memory jogged. Some of those people may be Spanish speakers who are not as aware of this case, so perhaps an article or an ad in a Spanish-language periodical in Utah may help and/or in the surrounding states. (Lots of truckers are Spanish-speaking).
This all costs money but perhaps fund-raising could help with costs.
I know it's a delicate balance for the friends and family who are reasonably wary about pointing the finger directly at Josh. They likely don't want to completely alienate him in the hopes he may talk, whether accidentally or not, and of course, so they can maintain access to the precious boys. What a nightmare!
I for one trust that LE knows what they are doing in this case and that they are working extremely hard to find poor Susan. There's no reason IMO to second guess them or Susan's friends and family at this point. I hope answers come soon.