[captainwhack]

I dont have a SC, but here is what I have
Tundra 2000 V8 Limited 4x4 135,000
I installed a leveling a kit back in 2003 (coil spacer and add-a-leaf, front and back respectively)
30" to 32" tires BFG A/T

Trailer - 2009 Jayco Jayflight 26BH (4800 dry)

UPDATE-----
I bought a new set of tires lastnight and went back to the OEM size of 30" which put me back at effective rear end of factory 3.9.
With the larger tires I was at 3.62
I noticed that my ability to climb the monster hill near my home has actually improved a little, I still cant maintain my speed, but it does not drop AS FAST (mph) as it was before.
Also engine temp is still getting up there, but not as high as it was.
I switched from 285/75(16) to 265/70(16)
I found at Napa they have a Modine 3 row that is supposed to be a HD version of the stock.