I agree stick with a brand bearing that is of quality, like timken, as for if the pillar bearing housing is strong enough, pretty much all of them come with spec's that list what they can handle, and from there consider the size. weight of what packer your wanting to use them on
I would always suggest going up a size or two over just enough as when you consider the stress and extra weight/load put on things like packers when the ground is uneven and your torquing on it as one side takes a harder impact than the other, or when gravity has it ways of it catching up to tow vehicle at times, that little slop in the pin connection can multiply weight put on hardware!
and JUST like the pillar bearing housing, the bearings themselves will have spec's on what they can handle
you can also maybe contact the maker of the bearing housing you found to find out spec's if no info is available from the seller!
other wise, if you again know the sized weight of your packer, try contacting a good bearing company and ask them for suggestion on a pillar bearing house!, lots of good bearing places out there these days
a quick web search should net you several near you if you look! or at least can pick there brain on suggestion on what you need!