That's the idea for wheels, yes. I think all this stuff is pricey though...
$9 per wheel/casing doesn't seem high to me, but $40 for the handle does. I have never looked for the handles before so not sure if the $40 is reasonable or high.
There is this handle option you could add to the back to pull the cab if you go with the tilt back wheels setup.
Steel Cabinet Handle

except me 

