6 inch lift and I tow a 5th wheel RV, skid loader, dump trailer full of material, etc. With larger tires, regearing is important and I use air bags to eliminate squat. It handles very well and predictable. To be honest, I get compliments all the time especially at camp grounds. While the truck never sees mud up to the doors, its nice to keep the body higher when travelling through fields or wooded trails (deer hunting, harvesting firewood) so the brush and sticks don't scratch so much.
I get a chuckle out of people to bought a diesel truck and most they've towed with it is a single axle trailer. However, at the end of the day if they want to buy and maintain a diesel to drive it empty as a commuter car its their right, just as they might want to lift it. This is America! The land of extremely unnecessary things! 300 channels of TV, muscle cars, A/C in most homes, private air planes, mansions, Chinese food, free porn, truck pulls and drag races, 511,000 local/state/federal politicians, bacon cheeseburgers, cigarettes, the EPA, and so on. Point is, sometimes people do things they want because they can.
Lastly, to invoke the butthurt, some people say these modifications are stupid because they are insecure about their trucks or jealous and don't have the financial or mechanical means (or really cool wives) to achieve it themselves. I have a buddy that reminds me how "wasteful" I was for getting UCF O-ring heads and how "useless" my ported intake is with a turbo. I just let it go because he can't do those things to his truck and he's just making himself feel better about his truck by ripping down other people's modded trucks.