Honest John Missle Kenworth ?

Thank you for the offer, but, I have some.
I found this little gizmo to help handle windows and such:

If you need some clear plastic, I have some laying around along with white in various thickneses.

Different time & place. Models were still heavily skewed to the 'toy' side as opposed to the serious scale model side of things through the end of the 60s. Renwal made some of the most detailed armor kits of the era. But even the Teracruzer/Mace kit did not come with any clear windows. 

Still, it seems like someone would say "we need to at least make a windshield for this truck". As for the mentioned GT40, that was just plain stupid!

TB, 
Yes, I was an engineer.

The trailer and cab of that kit are extremely old - early fifties vintage. At that time clear plastic parts were a high-tech rarity. Revell had a rather large line of 1/48 and 1/25 cars and trucks, none of which came with windows or windshields.

Seems strange nowadays, but I guess people in those early days of the hobby didn't notice - or care about - such things.

Hey B.J.

 I like your avatar . Were you an engineer on a R.R. ? Now , as to your comment .They have to know how , in order to think . Many folks sadly don't get trained that way anymore .  T.B.

Thank you. That will be easier than the Revell 1/43 Ford GT didn't didn't come with any heads or valve covers. You gotta wonder what these people are thinking...obviously they aren't!

Nope, it never came w/any clear parts.  You will have to source and add them yourself.  It shouldn't be too bad since it is all flat panes of glass.