Is my CFG configured correctly for cargodest

[WWTBAM]

Hi all ss my CFG configured correctly for cargodest? I have tried setting it up for only passengers to only be routed by cargodest.

[JGR]

cdstcargoclassgentype 13222222222

What you probably want is:
cdstcargoclassgentype 22222222231
For passengers to be routed only, and mail to be a mix of routed and unrouted (though with the default settings and a decent network, it'll be almost entirely routed).

[WWTBAM]

What causes stranded cargo? I have been getting stranded cargo at random times.

[JGR]

That is caused by cargo at a station having a destination that is no longer reachable from that station.
Usually because a route somewhere has expired between the packet being created and it being at that point, and there is no alternative route.

If the cargo should still be able to reach there, it may be because a service is too infrequent and the route is expiring between visits, you can bump up the route expiry delay in the config (cdstrtexprthrshld).