andyems

I have the Rough Country 2 inch leveling kit on the way for my '07 Silverado. I want to upgrade the tires to a larger size than the stock 265/70-17s. I have looked at the 275/70-17, but they are only made in LT load range, not P metric. They are however only load range C, and I was wondering if anyone knew much about changing from P to LT tires? I am afraid if I go up to the 285s that it will be too big, and my mileage and power will suffer, and the 275s seem like a nice medium area, all except for the LT rating.
I rarely tow or haul, mostly just empty driving, and it's a reg cab Z71, so it doesn't ride like a Caddy to start with. Any ideas on this? Also, if I do upgrade to the LTs, will my stock TPMS read the higher pressure levels without throwing up a "high" red flag? Thanks for the help.