I know the 10.5 guys , some of them do. You need the tall tires. Weld has lately been making 15x15 beadlocks, I dont think they make 15x14s yet.
Im not sure on the theory of the wide rim for these tires, but Im sure the beadlock is to hold the tire bead in place. On regular rims, the tire may come off the wheel bead.