I don't have the specs, but the question has been answered here before by MorePower and DmaxMaverick. Do a search for "wheel bearing" and I'll bet you find it in the first couple posts.
Dmax mentioned that the weight of the truck should not be on the wheel until that axle nut is tightened. The weight of the truck (vertical force) is really supported by the bearing only, but I believe he has a valid point, as the only thing resisting any horizontal forces when the axle nut is not tightened is the press fit of the bearing hub and internal snap ring. As you lower the truck to the ground, most times you will notice the tire pushing outward as the weight of the truck is taken up by the suspension. this could put undue horizontal stress on the wheel bearing
My method for this is to have a helper step on the brakes, as the hub and brake assembly should be fully re-assembled by that time. I've gotten over 100K miles out of my last set of replacement Timkens on my 04 (135K miles on the truck, OEM units failed at 30K) and just replaced the passenger side again. So far so good.
Best of luck,
Leo
2012 Chevy 2500HD ECSB, 6.0L gas, auto, 4x4, LT
2003 F450, 7.3L PSD, 6 spd stick, 2wd, dump truck
1983 GMC K2500 pickup - working on a Cummins 5.9L swap
1987 GMC K3500 Dump, 6.2L diesel, TH400 auto - project plow truck