5th wheel and tongue tow trailers. I think you will find that the 5th wheel turns differently from the flat tow mainly because the pivot point is in front of the rear axle of your tow vehicle instead of behind it.

The 5th wheel will turn in a smaller radius whereas the flat tow is limited by the tow bar impinging on the chassis of the tow vehicle. I have actually done the dumb**** thing of breaking the rear window of my pickup with a corner of my 5th wheel. Probably wouldn't have happened if I had an 8 ft bed instead of a short bed.

To directly answer your question: I don't know. Probably takes a mathemetician to calculate. Of course, if your confines are as tight as you say, no calculation will survive the first actual attempt.