I've used XZY in the past, found them good on road and they deflated well off road as well (in 7.50x16). They are very thick and have lots of plys so reistant to punctures. Heavy buggers though.
I'm using Cooper Discoverer STT now as well and am very impressed - very tough and long lasting and grip really well on all surfaces.
Maybe a tad aggressive for lots of dune/sand driving, as you could really feel the tread biting into the sand rather than floating, but they do a less chunky ST version.
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