A very successful Freightliner dealer on my tool route had a hugely successful Glider program but sorry, those trucks weren't allowed into Cali. The remanned 60 series Detroit's were solid powerplants but they all were pre Def. They did build some CNG trucks though and a lot of custom trucks for haulers here in Iowa. What a fun shop to visit. They could put one out in a day and a half and had at least a dozen going at all times.