I was in El Dorado today, and I noticed that in addition to the truck routes already in the HB, there is a Truck KS 254, around the the south side of town, following Kansas Ave, Traffic Way, and Haverhill Rd. However, after some GMSV digging, there appears to be a well-signed truck "loop" around El Dorado that is just signed based on what highway you're going to (the northwest side follows Haverhill + 6th).
How will this work? I guess the routes could be extended around the "loop" as necessary, given that it doesn't self-intersect (by about three blocks or so)... but I don't know.