Roger,
I hope some of the following information helps answer your questions...
I had the Air-Lift system on my T1OO and it was excellent.

I installed it with the Load Controller 1 and I'm glad I did.
As for your Tundra the Ride Rite system may be a better kit.
They make two different systems:
2WD and
4WD
IMHO, Ride Rite offers better
Air Accessory Systems
I have the complete Ride Rite kit for my 4WD '02, but have not installed it yet.