As above, long story as to why! And adecent amount of hassle to try myself.
Sunn Doublewides must've bee close to 50mm (ext) plenty folk ran 2.2 Michelin comp 16s on those with no drama back in the huck to flat days.
Guessing you mean some Fatbike things tho.
I've put a schwalbe hans dampf and racing ralph (both 2.35) on a Dually and it works well.
Almost, 45mm dually with 2.25 nobby nic & 2.4 ardent. Sidewalls stick out further than the tread but as it's not Rocky around here it's not been a problem
Have run 2.35s with 40mm rims. OK no problem.
Put one on a 50mm rim and didn't like the way it squared off and there were no lugs projecting at the sides so didn't proceed.
About to try Dirt Wizards on 56mm rim. Will report back. (Got to build wheel first 🙂 )
You trying the 26er 2.75" DWs or the 29ers, epicyclo?