I found my problem. It is with TM:PE mod. I have turned it off and now the buses load correctly. I will uninstall the mod and reinstall and see if that corrects things. I was going to delete my comment, but one day someone might have a similar issue so ill leave it here if that's ok, in case it helps someone else.

Can anyone help.... This model was working with no problems, now out of no where the trailers arent showing up on any of these buses. It's not realated only to this specific model tho, all of my articulated buses dont have trailers. Sorry to comment in here because its not just this model im just not sure what I have changed in my city to make this happen, any help would be great.

thank you

Great work! It will make a fine addition to my city