As you can see, it has 2 of each terminal. The supplied wiring diagram only shows one being used. I have two identical 24v strips that I want to dim together - can I just wire them both in?
Some speaker wire, like 18awg stranded is more than enough to extend to the next led strip, if each of your strips is 40w or so you can run quite a few.
The strips themselves probably can't transmit more than double their own draw, but the strip should tell you max length on it somewhere.