Most of the time I just spell T-R-U-C-K.
I've noticed though that the handshape of the "C" tends to mutate a bit when
spelling T-R-U-C-K. The "C" in TRUCK tends to use just the thumb,
index finger, and middle, finger. Here is an example of the modified C:
TRUCK [Verb Form]
Here is a good version to use while telling a story and you want to show the
driving of a truck, as in, "He was driving along..."
TRUCK:
"English" version.
NOT recommended.
Those of you studying ASL, please don't get all riled about this next
version of the sign "truck." Some people will say, "tsk,
tsk, that's English." (Meaning that it is an "invented Signed English"
sign.) I'm listing it here because any serious student of ASL would want to at least
be aware of this variation-- so that he or she will recognize it when it is inevitably signed by some Deaf
person somewhere.