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The X2's are manufactured by NorthStar, which was purchased a few years back by EnerSys, which also owns the Odyssey brand battery as well. They are probably the single best battery manufacturer in North America. They are a big name in off grid and standby batteries, and I have no reservations...
one thing though, you don't want batteries that are any taller than the 6T series. Too tall and they don't fit properly under the seat base/battery box cover, and you increase the risk of shorting them out or damaging them.
6T is 9" high, so nothing taller than that.
I always tell people it depends on how you plan to use the truck.
If it's going to stay pretty much always on roads and within cell phone/tow truck range, then run whatever you feel comfortable with. 650+CCA and a decent reserve capacity is all you need in all but the most extreme conditions...