Never used heavy throttle.  1st gear crawling on small / medium rock gardens, (picture an *easier* mini rubicon @ hollister is about the size of the rock garden.) and Hollister   Not my rig, but he purchased the UM-05 to save money.   When those went, he purchased the UM-06's and is one happy camper now.   

I'd say he is a mild wheeler, besides the local rock garden the hardest trails the rig sees it what's at hollister(hasn't attempted mini rubicon yet).  He runs 35" toyo's, one 4.0 box, 5.29 gears, welded front and rear, and is always light on the throttle. 

If it matters he runs the 35x 13.5 toyos on 15x10.