I'm not sure it is trust, the same as I'm not sure about this..........
It looks to me that it should be trunk but the writer has got in a muddle as to the spelling and has written tryke - I'm very unsure that it is a 'k' and the 'n' is missing!!!!
Slam's pennyworth may well be more on the right track.
Well, we have to explore every option, don't we!!!!!!!!
Hephzibah