If I recall correctly - It was about $250-$300 including the 2 hours of labor.
It is basically a pair of rectangle shaped blocks of steel and some harden bolts with self locking nuts.
We'Ve happy with the results. Of course, after the lift kit I had to adjust the equalizer hitch to match the new trailer height which the dealer did as part of the work. After the first trip at the new height I moved the wd saddles up 1 bolt hole and it has been a great purchase.
2008 Silverado EXtCab 6.0 Vortex Max
2010 Forest River Surveyor SV-294
Equalizer 1000 WD/SC hitch
Prodigy Brake Controller