First a comment on RV Professionals, I have not found one yet, ok that is my rant.
It depends on the type of wheel bearing.
The below is from another post of mine.
If you do not have an oil bath bearing or a hub bearing you many find this useful.
I saved all my tools, learned the lesson never sell a tool as you get nothing for them and as soon as you sell one you need it. This is a bearing packer and does a great job. The bearings are the ones from the trailer (seals said dexter on them, bearings are from china).

This is a photo of the bearing in the packer, I am using red grease, brand can be seen in the previous photo. Note that it came out right away (leading edge white, indicating very little of the grease that was used to pack the bearings a CW)


Now these bearings are PACKED with grease, excess can be wiped away.

So.... now back together we go.... a little grease on the spindle.

Seal seated correctly.

Correct preload on the bearings and spindle nut retainer in place. To get the correct preload tighten the spindle nut while turning the drum. when the spindle nut meets resistance, stops turning with a small amount of effort (a light touch is needed), back the nut off one flat (just far enough that you can get the cotter pin through one of the openings in the castle nut retainer.
If you do not under stand this get help.
