FWIW, I struggled to mount both Veloflex Masters and S-Works Turbo tires (neither of which is tubeless) on the LB AR36 rims. In fact, ripped the skin off left thumb while trying to mount the former and destroyed a tube trying to mount the latter.

Never had this issue with tires before (Turbo Cottons mounted like butter on CLX64s and no problems installing latex tubes on them).