Hi jfrack77, I just had my converted from a V hull boat to a three bunk toon setup. The price is going to depend on the manufacturer of the lift. My lift is a Hydrohoist and it
14 years old. The two bunk kit cost $1400.00 plus tax. The install which included taking the lift out of the slip moving it to dry land to reverse the lift arms and setting everything up cost additions $1100.00. A lot of money for sure. But in the long run it' s a good investment. If they didn't have to reverse the arms.it would have only cost $375.00 to install the kits.
One thing I leaned is the bunks on the lift should be within 12 inches of the end of the toons. So as to support the weight of the engine and fuel tank. This is according to Hydrohoist engineers. The installer had the bunks set at 39 inches from the end and had to come back and move the lift.
If you move forward with this I suggest you check with the lift manufacturer for proper placement of the bunks per their specs. Good luck. Enjoy your Bennington