I would consider the Swamper SSR's if I were you. I ran Swamper TSL radials on my 4Runner and I gotta say.. they were AWESOME off road.
I wanted to go with SSR's on my Ram because the voids were slightly smaller and I figured they would be a little quieter and wear longer on the heavier rig.
**Pure speculation on my part I admit** <-(disclaimer so you guys that have actually run both don't flame me!

: )
I couldn't get SSR's in a 33x12.50x17 and money kept me from buying new wheels to go 16's.. so, I bought the ProComps M/T's from 4WParts (buy 3 get one free!) and so far so good.
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Greg
2001 Ram 1500/black/quad cab/sport/off-road package/Pioneer deck, CD changer, & speaks/ JBL & Fosgate amps (630 watts)/2x10" Kickers
K&N filter / Dynomax Ultraflow 3" catback / 33x12.50x17 ProComp M/T's