You can change the tire size on any tune other than the "Stock" tune (what your truck came from the factory with).
The Levels are just numbers. 1, 2 and 3. The Stock tune is at Level 0. You could just as easily call them Level A, B and C.
Your driving sounds a lot like mine, Except I DO see high RPMs once in a while. One place is in passing on 2-lane country roads (I prefer to get around the other guy quickkly) and, when pulling my trailer up a steep mountain highway that's fairly straight with a normal speed limit, the RPMs will be high due to the lower gear.
I'd get a custom "daily driver" tune set up for the kind of driving you do and your driving style - you need to tell Bill these things. And, I'd get a custom towing tune for that 6K trailer. I'd put these tunes in the Level 1 and 2 positions, leaving the Level 3 93 octane performance tune alone. If you put in a commercial CAI, Bill needs to know it.
- Jack
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