This layout becomes better every day, Jimmy ! It is really interesting.
Especially the addition of the sub.
However, if I may, the low loader appears rather more than "weedy"
for the purpose. It was by chance that I today (yes!) came across a
project of a German modeler: klick!
And the next post in this thread links to a clip where the transport of an old sub
along the Rhine river to a Technik Museum in Speyer can be followed
(starting 1:36).
A bit hefty the vehicles they had to use on the ride from river to its final location...
(Please don't tell me "Those Germans always overdo it" - I think, Revell underdid it.)
Of course, you should use only what really fits onto your layout.
Not only that it is your layout, important also that imagination often is more
relevant than meticulosity.
All the best
Armin