The 8 lug pattern is the same- - - -the problem is the diameter of the brake drums. Most drop-center tubeless rims won't clear the big drums, especially if it's got the 1-ton brakes. The 19.5" rims are big enough inside to clear the large diameter drums.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!