It is a great idea to get aftermarket UCAs to help with the alignment. Honestly, it will make the vehicle safer to drive at speed when properly aligned. I couldn't believe the difference in handling and stability after installing aftermarket UCAs that allowed for alignment within Toyota specs. This would be the only reason to do so unless you were doing a crazy high end suspension that would promote greater travel, in which case you would have to go with a UCA that could handle the greater suspension travel and not bind up.