...and finding 36h rims can be a REAL PITA..I tried)
I rebuilt my wheels with 26" Sun Ringle Rhino XL (36h) rims. And have Maxxis Holy Roller's 2.4 mounted.
These wheels are also compatible with rim brakes should you go that route. I have Shimano BR-T4000 rim brakes on my electric Electra Townie with Clark pads and can lock the wheels.
Though in short supply you can find Rhino XL's online.
SunRingle RhynoLite XL Rim :: From $42.00 :: SunRingle 26 Inch Rims
Another option is Sun Ringle's MTX-33 (though this one is disc only)
SunRingle MTX-33 Disc Rim :: From $41.00 :: SunRingle 26 Inch Rims
And there are Velocity Ciffhanger's - but expensive.
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Good luck with the build!