I used "Copex" - but to make it a little less trip hazard-y I used 4x 30mm dia runs which I then tie wrapped together with the ratchettuy bity hiding i nthe recess o nthe underside.
This method has 2 advantages:
1) I could group the cables to gether in "destination" bundles, thus keeping them enclosed for as much of the run as possible. (my A-frame cables the copex is stuffed up the bottom of the frame pipe so is totally enclosed the whole way)
2) across the floor I had a 30mm high x 120-ish mm wide "flat" cable run instead of the 3" diameter trip hazard you get sticking miles off the floor with one big one.
....and Copex (other brands are available!) is avaialble at a sensible price from any electrical wholesaler.