Walmart carries sets for 1" and 1 1/16" spindles...about twelve bucks for both inner & outer bearings, cups (races) and the inner seal. Chinese bearings, yadda yadda, someone won't like it, but they're rolling on `em each day, regardless. The bearings I took out on my trailer Chinese, and were fine---I decided to replace them solely because the trailer was a 1996, and I had absolutely no idea how old the bearings were, or what condition they were in.
I found I had to really torque down the spindle nut to "preload" the hub and get the slack out of the bearing assy...back off it once it's set, but don't be shy about the initial torque.
You'll have to beat the bearing buddy off each hub. I used a piece of 2x2 or 2x4, just try to catch the outer edge and get it started "tilting" in the hub, and keep working you way around it...once it starts, you'll get the hang.
Pry the old inner seal out with a big flat tip, and use the flat tip to drive the old races out (hit the flat spot on the "inside" of each race---from the opposite side of the hub--drive each race out the same direction that it's bearings came out. They are a tight fit, you'll have to work your way around the circumference of the races, moving em just a little at a time. Wipe out all the old grease from the hub, and fill it about as full as you can. Drive each race back into the hub, making sure you don't do it *backwards*. You have a (much smaller) lip on the races to drive them, when replacing them...be careful. You can use one of the old races to help "start" each of the new races...otherwise they'll wobble around the mouth of the hub and antagonize you. Pack your new bearings, and seat the inner bearing. Seat the inner seal with a piece of 2x4, driving it evenly with the flat side. Pack more grease round the inner bearing, and pop the hub on the spindle. Seat outer bearing, pack more grease, do the washer, nut, preload, unwind a bit, and do the cotter pin. Pack more grease in there (seeing a pattern here?).
For grease, I used the Walmart brand marine NLGI wheel-bearing rated grease. Everyone has their preferences, I go by the rating (and won't touch any oil & lube that doesn't carry a rating) and haven't been bit yet.
The bearing buddy gets beat back on, with a hammer and block of wood.
Personally, I'd say to put some saran wrap and a rubber band around each hub, and drag it around the block, nice and slow, a couple of times...then jack her back up, and check for slop in the bearings. If there's wobble, take up the slack on the spindle nut, and either re-check or smack the bearing buddy back on...my first replacement set surprised me, and I ended up wrecking the seals the first day I towed it.
