Which of these two options is the better and more reliable way to lift my '07 RR HSE 2"? I want to install 295/55/20 tires (not sure which yet) and don't care to pay the extra $$ for the IIDT scan tool if it's worth it? I assume you can adjust the lift 2" and it will stay there if I go with the scan tool over the Johnson Rods? Lastly, are there extended bump stops that I can install just in case my bags go? Thanks everyone for your help.