As a site carpenter I just plain don't have the space for a 3000 rail and the 1400 rails (55 inch or 3.1428 cubits for the Merkins) fit across the width of my van.
Two 1400 rails do work with a TS55 for 2440 (5.485 cubits or 96") ply sheets but its tight, its worth just putting a pencil mark on the rails to show where they need to start on the plywood sheet.
Makes setting the cut up simpler.
A 1900 rail allied to a 1400 would be a good option but the 1900 wont fit across the van width and I'd have to put it somewhere else no biggie.
A 3000 just isn't happening though.