So, I only do this with my two table looms as I have a sectional beam on my David 3. Probably the longest warps I put on those looms are 6 yards. I do "yank and crank" with those so don't need to weight the warps as I wind on. I wind a little, go to the front of the loom and yank evenly across the warp. Go to the back of the loom and insert a warping stick, wind on some more and then back to the front of the loom.
This has always worked well for the table looms.