Take the slide half way out or so, put a nail into the roller stop (usually on right end), remove the tube assy from the brackets, roll up a turn or two, move slide in, then reinstall tube and remove nail. Do again if not enough.
If a real long tube, suggest 2 people to to the tube rolling!!!
'16 Outdoors Timber Ridge 280RKS
Reese 1700# Trunnion w/ DualCam HP
'03 EXCURSION XLT V10 4.30 Axles