trail grapplers are one of the quietest mud tires and have long wear life, i have ran both and yes the terras will last a little longer but will suck compared to the trail traps if you hit mud. They are both E rated so if you tow, it won't matter which tire you run.
I am currently running the Dune Grapplers, look killer and hook up good on the street. Not sure how they work in the dunes lol.
--2013 CC Z71, Edelbrock charged, cam, long tubes, 4.5" Zone, 285/70/18 KM2s on Gear Big Block, Kenwood system, LineX, Retrax, Katskinz, NFab.
--2012 Dmax CC Z71, Cognito UCAs, braces, Fox 2.0, LineX, Nfab, Retrax, Ranch Hand Front/Back, Custom Katskinz, Black Gear 18x9 wrapped in 285/70/18 Toyo MT.