Suspension parts are just a way for companies to make money. You can throw all that stupid suspension stuff away and just run bigger tires. Put a bump stop in the fender, though. Otherwise the tire will dent it.
I'm assuming that you've already bought the kit, so why not install the UCA, UCAs are great. I have never seen a sircumstance where they have done anything but improve the ride of a vechical both on and offroad.
TTORA forum is the best Toyota off-road club around. We are nation wide with chapters in most states. Come in and discuss Tacoma, 4Runner, Highlander, & TRD models.