I purchased a 2008 LX570 a while back (posted about it in the 200 series forum). Had a transmission issue and the dealer bought it back from me rather than repairing it under warranty. When I bought the LX I was really in the market for a 100 series. A couple of my buddies have 100 series rigs but they don't really tow with them. I'll be towing a 21' bass boat (fully loaded around 4000 lbs) regularly. I'm aware that the 06-07 vvti engines/5 speed trannies are probably the best for towing but how bad are the others? I've came across a couple of really clean 04-05 trucks but would like some real world opinions of how it would do. Here in East Tennessee, we have hills everywhere so it'll be up and down while driving. Mostly 2 lane highways but interstate travel isn't unusual. Anyone have any thoughts?