Here are photos of one I have on ebay.
It sure looks and feels like EMT, 3/4" or 1"
I considered building a couple and selling them,
but my welding skills are not good. If you knew
what you were doing welding and bending pipe
it would probably be pretty easy.
I never used this one, but borrowed one from
a friend previously. With a helper this is still
heavy work, but the handles makes it much
easier to manage.ebay Hive Carrier