Hi Katrina,
'My two bobs worth'.....
You have a very capable tow vehicle vehicle there & with a Kedron hooked up to it you will be travelling first class & be the envy of many.
The first three items on your list are very worthwhile & really will enhance your overall experience of your Toyota ownership.
Re, the fitting of the extra fuel filter there are many 'arguments' about fitting the auxiliary filter before or after the 'factory' filter.....seriously consider having it fitted before the 'factory' filter.
Your vehicle has a price tag of about 100k and probably not much older than twelve months if that, I (personally) would have serious reservations doing significant engine/transmission upgrades while you still are in the early part of your Toyota warranty, doing a remap, intercooler & torque converter 'upgrades', you could have serious disappointments from Toyota denying (possible, although highly unlikely) claims on engine, transmission & driveline.
Hoping we meet up one day at a gathering or somewhere down the road.
Travel safe
Tony H