Adding to that is that when those wheels are re-centered they frequently get a flat plate center. I suspect that this is because there isn't a formed center that fits that is available. A friend of mine went the flat plate re-centering route and hated every minute of driving that truck on the pavement. The unsprung weight made for an awful ride even with Bilstein remote res shocks on it. Clearly not a good choice for a long distance driver (i.e. Western Deserts & Colorado from the Bay area).
USA 6x6 had the pressed centers (made by stockton wheel) But they went under..
there are options coming for the pressed centers.
btw, my 40's got the flat plate centers.. Rides great on the road. But I also paid a lot of attention to getting them straight...