You have bags, that will level it. Consider getting rid of the shocks, forget rancho. If you bother with shocks go right to the Bilsteins.
Personally, i would pass on any tuners. Little gain, much to lose.
Unless you are out of warranty and want to all kinds of work. But, still little gain for the $$$ invested.
Consider carrying spare fuel filters. Besides the filters I also carrry a complete filter housing with the drain plug and "water in fuel" sensor. Simplifies on the road changes. You need a big socket to remove that housing.
TPMS - tire pressure monitor system, if you do nothing else, start there.