Find a level spot (parking lot etc)
Drive (track) the truck 75 to 100 feet straight, get out and look at the cams.
Adjust both to be spot on centered.
Mark bars left and right and once set, do not flip flop sides, keep the WD bar on the same side. They are forged bars, not machined, they are not the exact same length.
Drive around again, re-track the truck straight and check again.
Hope the helps
John
2005 Ford F350 Super Duty, 4x4; 6.8L V10 with 4.10 RA, 21,000 GCWR, 11,000 GVWR, upgraded 2 1/2" Towbeast Receiver. Hitched with a 1,700# Reese HP WD, HP Dual Cam to a 2004 Sunline Solaris T310R travel trailer.