Re: Inner wheel bearing race install
You can get the driver tool from Oriely's or other auto parts chain that has a loaner tool program.
I also can't quite visualize what you mean by "hub collar". The inner bearing pops out the back after you remove the seal, then goes in before you put the seal back in. The inner races on my trailer at least are smaller OD than the rear seal, so you set it in (I suspect the offset where the seal fits is what your calling the "collar"). You need to pound on it with something smaller than the OD than the seal, but about the same OD as the race itself. Either the tool or the old race will work, but if you do use the old race, be sure to put it in with the thick side into the hub, so you have a lip to knock it back out with after your new race is fully seated.
You can also use a large socket:
Asian Bass Guy UFP DB-42 removal and install of race, bearing, and seal - YouTube @ 7:30