Hi Rob,
I dont use the tanks, for me it would be no quicker as I work with helper, I can have it off the van and filled up at the door in a matter of mins while the other person is vacing and pre-spraying.
I use normal 1 1/5 pipe and have 18, 25, 33, 50 ft lengths in the van but most of the time I use the 33ft for doing a house. Ive had a go on the 2" stuff its good.
Mark