I got it to work. I am using Husky's 53ft Reefer Trailer. I added a lot of cargo and renamed/edited def files to follow 1.38 protocols.
Two things: (sorry if have been covered before)
After editing game.sii in Speditor, I start game with saved job already chosen. Good. There is no route defined for destination, but 'green flag' does exist at company. This is correct, yes?
with 'own trailer' ticked, all cargoes appear in list properly. Great! But I can only create one job. There is no add button. Yes?
Other than that, works perfectly! Thank you so much!