I think that "C-shaped" part/piece, that goes behind/inside the glass, runs most of the length of the 4 main trim pieces - they are the problem.
I haven't done an install on a truck but the '57 Chevy sedans use a similar technique to secure the upper moulding.
I made sure the trims were correctly seated before the install.
I initially fitted the chromes then realised they were not
fully seated in the rubber,I spent a little more time making sure the 'C' section was fully tucked into the seal and then taped the heck out it.
It then fitted without issue.
The biggest problem I've encountered by far is the fact the trims have been 'tweaked' during removal,if that's the case they will fight you all the way.