Rear Flip Kit Towing and Ride Quality?

[Joey-D]

I just bought a 99 Silverado 2wd 4.8 standard cab SWB. I have been looking at drops. First I wanted the 3/4, but after realizing I could do a 4/6 for cheaper, I got thinking about it. The only thing holding me back is how does a flip kit do towing. I have a tandem axle car hauler and plan on towing that behind the truck on ocasion. I will be adding some airbags on back for extra support, but how does things change when put the axle over the spring. I figured I could buy new spring perches for $13, weld then on the bottom of the spring, and make my own c-notch. Minus shocks, add ubolts and I have $25 in a rear drop, then coils and spindles or a-arms up front. Any opinions on this would be greatly appreciated.