If you are in Indiana and near Elkhart there is surely someplace that can do it for you.
We had the Dexter Nev-R-Lube's on ours and they served us well for 6 seasons and about 45K miles. I never had a problem with the hubs themselves but did have a problem with tire wear, which may have been an alignment issue. We hit some pretty rough roads in those 45K miles. Also, had a problem with the leaf springs coming out of alignment, they would spread apart and each season I would have to take a hammer and bang them back in place.
I did have some concerns about what would happen if we did have a problem. Some have said they carry an extra assembly but I never did. Last fall we had the whole axle system replaced with MorRyde IS and Kodiak hubs with discs, which uses readily available parts. They will have to be serviced every couple of years but at least I'll know what kind of shape they are in. So far I'm happy with the change.