Those C13 jacks are pretty straight forward.
BLACK = HOT
WHITE = NEUTRAL
GREEN = GROUND
or
BROWN = HOT
BLUE = NEUTRAL
GREEN/YELLOW STRIPE = GROUND
Female:
| (g)
(N)| | (h)
Male:
| (g)
(h)| | (N)
The advantage of a switch would be having a (pretty high rated, and probably will never blow) fuse in the case of a serious power surge, and also a nice handy master power switch on the outside of the cab.
That layout sounds like it would work fine, and no, theres nothing inherently dangerous about this type of wiring if you make sure and use common sense while doing it. After all, this is the same basic wiring as all the outlets in your home. Youre basically just hardwiring a power stip to an outlet.
(Also, first post. Not too great at posting images yet. Trying to help and be cool!)